vdr-plugin-osdteletext

Changes:

• More refactoring of the TxtStatus class (Thx to Sören Moch!)
• Install plug-in to lib dir with --remove-destination as suggested
  by Christian Wieninger (Closes #57)
• If background is configured to completely black or transparent,
  toggle between black and transparent only.
• Updated Italian translation provided by Diego Pierotto (Closes #60)
• Fixed problems with VDR >= 1.7.3 (not all teletext pages accessible,
  4 GByte VTX files)
• Removed unnecessary DVBDIR from Makefile