* moving some of the commonly used bit reading/writing functions
      from common.c -> common.h so that they can be inlined.
         + performace gain ~1% (measured with DV decoding)
	 + code bloat 0.05%
      Looks like a win-win solution.


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@2874 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b