Update compilation documentation and tarball script

INSTALL.txt

@@ -2,14 +2,57 @@ COMPILATION GUIDE FOR LINUX/UNIX USERS
 **********************************
 YACReader and YACReaderLibrary are build using qmake. To build and install the program, run:
 
-qmake
+qmake-qt5 CONFIG+=[Options]
 make
 make install
 
 from the source dir. For seperate builds of YACReader or YACReaderLibrary, enter their respective subfolders and run the commands from there.
 
-Build options:
+Dependencies:
+-----------------------
+
+- Qt >= 5.3 with the following modules:
+	- declarative
+	- sql
+	- script
+	- multimedia
+	- imageformats
+	- opengl
+	- sql-sqlite
+	
+- poppler-qt5
+- qrencode
+- sqllite
+- glu
+- a decompression backend, either 7zip or unarr (see below)
+
+
+Decompression backend:
+---------------------------------------
+
+YACReader supports two decompression backends:
+
+- unarr
+- p7zip=9.20.1
+
+These can be selected at build time by adding either CONFIG+=unarr or CONFIG+=7zip as an option when running qmake. 
+If none of these is provided, the build system will default to unarr on Linux/Unix and [p]7zip on Windows and OS X.
+
+The decompression backends have their own dependencies and require additional steps like downloading additional source code
+for setup. Please consult the README files provided in the compressed_archive and compressed_archive/unarr folders for details.
+
+If you chose to build YACReader with p7zip as a backend on Linux/Unix, please take notice that this backend has some problems:
+
+- p7zip > 9.20.1 is not supported
+- p7zip 9.20.1 has known bugs that are fixed only in the later versions
+- a system update that replaces p7zip 9.20.1 with a later version will make YACReader unusable
+
+If your system already ships with p7zip > 9.20.1 you can place 7z.so and the Codecs folder with the Rar29.so from p7zip 9.20.1 in /usr/lib/yacreader 
+YACReader will check this folder first and can thus continue using 7zip as a backend with p7zip > 9.20.1 installed on your system.
+
+Other build options:
 ---------------------
+
 You can adjust the installation prefix as well als the path make install uses to install the files.
 Use "qmake PREFIX=DIR" to configure YACReader for your systems default prefix (for example "/", "/usr", "/usr/local").
 
@@ -24,7 +67,7 @@ On embedded devices that don't support desktop OpenGL, it is recommended to use
 
 qmake CONFIG+=no_opengl
 
-This will remove any dependency on desktop OpenGL.
+This will remove any dependency on desktop OpenGL and hardlock rendering to software.
 
 
 DO YOU WANT TO HELP YACREADER?

compressed_archive/README_7zip.txt

@@ -1,7 +1,13 @@
-If you are trying to compile YACReader, you need to donwload de source code of 7zip (Windows) or p7zip (Linux/MacOSX).
+If you are trying to compile YACReader with a 7zip decompression backend, you need to download de source code of 7zip (Windows) or p7zip (Linux/MacOSX).
 
-Please, extract it and rename the folder to lib7zip (Windows) or libp7zip (Linux/MacOSX), then copy it to $YACREADER_SRC/compressed_archive/ (this 
-folder). If you are using a 64 bit Linux-System, please apply libp7zip.patch for successfull compilation or use compileX11.sh.
+Please extract it and rename the folder to lib7zip (Windows) or libp7zip (Linux/MacOSX), then copy it to $YACREADER_SRC/compressed_archive/ (this 
+folder).
 
-YACReader is compiled using 7zip/p7zip 9.20.1
+YACReader is compiled using 7zip/p7zip 9.20.1 and will not work with newer versions.
 
+On Linux/Unix this means your YACReader installation will stop working if you update your installation of p7zip to a newer version. If you wish to keep using
+p7zip with YACReader, you can copy 7z.so and Codecs/Rar29.so from p7zip 9.20.1 to "/usr/lib/yacreader/". YACReader will then detect these files and use
+them instead of the system provided p7zip files which allows you to keep both YACReader and an up to date p7zip installation.
+
+Please keep in mind this is only a workaround that is provided for backwards compatibility and not intended as a long time solution. 
+It is recommended that you switch to unarr as a decompression backend instead (see README.txt in compressed_archive/unarr).

compressed_archive/unarr/README.txt

@@ -1 +1,6 @@
-To use unarr download https://github.com/zeniko/unarr/archive/master.zip and extract it in this folder. Run qmake with CONFIG+=unarr
+To use unarr as a decompression engine when building YACReader, download https://github.com/zeniko/unarr/archive/master.zip and extract it in this folder.
+This will build unarr as a part of YACReader (static build).
+
+If you're on a Linux/Unix system and prefer to use unarr as a shared library, have a look at https://github.com/selmf/unarr/
+This fork of unarr includes a CMake based build system that allows you to build and install unarr as a shared library. YACReader will detect and use 
+the installed library at build time if it is installed.

mktarball.sh

@@ -2,7 +2,7 @@
 #Script to create a source tarball for YACReader distribution and packaging
 #This should be run from YACReaders top source directory
 
-YACVERSION=7.2.0
+YACVERSION=8.0
 if [ -f Makefile ]
 then
 	make distclean
@@ -17,6 +17,6 @@ fi
 #Use tar's --exclude feature to make sure we get a pristine tar for distribution.
 #Exclude all version control system related files and rename the top directory in the tarball using --transform.
 tar cfJ yacreader-${YACVERSION}-src.tar.xz  --exclude '*.rej' --exclude '*.orig' --exclude '*.gch' --exclude 'dependencies' --exclude '*.o' \
---exclude 'yacreader*tar*' --exclude '.hg*' --exclude 'lib7zip' --exclude 'libp7zip' --exlude 'unarr-master' --exclude-vcs ./* --transform s/./yacreader-${YACVERSION}/
+--exclude 'yacreader*tar*' --exclude '.hg*' --exclude 'lib7zip' --exclude 'libp7zip' --exclude 'unarr-master' --exclude-vcs ./* --transform s/./yacreader-${YACVERSION}/
 #Calculate checksum to enable packagers to verify whether they are using the original tarball. 
 md5sum yacreader-${YACVERSION}-src.tar.xz > yacreader-${YACVERSION}-src.tar.xz.md5sum