Remove functions documented (but not marked) as deprecated

Clean up other stuff with comments about binary incompatibility,
but only as far as to mostly keep source compatibility.

taglib/mpc/mpcproperties.cpp

@@ -66,13 +66,6 @@ public:
 // public members
 ////////////////////////////////////////////////////////////////////////////////
 
-MPC::Properties::Properties(const ByteVector &data, offset_t streamLength, ReadStyle style) :
-  AudioProperties(style),
-  d(new PropertiesPrivate())
-{
-  readSV7(data, streamLength);
-}
-
 MPC::Properties::Properties(File *file, offset_t streamLength, ReadStyle style) :
   AudioProperties(style),
   d(new PropertiesPrivate())
@@ -93,11 +86,6 @@ MPC::Properties::~Properties()
   delete d;
 }
 
-int MPC::Properties::lengthInSeconds() const
-{
-  return d->length / 1000;
-}
-
 int MPC::Properties::lengthInMilliseconds() const
 {
   return d->length;

taglib/mpc/mpcproperties.h

@@ -48,14 +48,6 @@ namespace TagLib {
     class TAGLIB_EXPORT Properties : public AudioProperties
     {
     public:
-      /*!
-       * Create an instance of MPC::Properties with the data read from the
-       * ByteVector \a data.
-       *
-       * This constructor is deprecated. It only works for MPC version up to 7.
-       */
-      Properties(const ByteVector &data, offset_t streamLength, ReadStyle style = Average);
-
       /*!
        * Create an instance of MPC::Properties with the data read directly
        * from a MPC::File.
@@ -67,22 +59,12 @@ namespace TagLib {
        */
       virtual ~Properties();
 
-      /*!
-       * Returns the length of the file in seconds.  The length is rounded down to
-       * the nearest whole second.
-       *
-       * \see lengthInMilliseconds()
-       */
-      // BIC: make virtual
-      int lengthInSeconds() const;
-
       /*!
        * Returns the length of the file in milliseconds.
        *
        * \see lengthInSeconds()
        */
-      // BIC: make virtual
-      int lengthInMilliseconds() const;
+      virtual int lengthInMilliseconds() const;
 
       /*!
        * Returns the average bit rate of the file in kb/s.