Attempted fix for 32 bit overflow in floor1 line fitting for very low  bitrate modes with oversized blocks.  Should close #1658.
Attempted fix for 32 bit overflow in floor1 line fitting for very low 
bitrate modes with oversized blocks.  Should close #1658.


git-svn-id: 03f0f1727258f1959b7b485b30a676bafdb78148@17032 0101bb08-14d6-0310-b084-bc0e0c8e3800

soundcloud/vorbis,fcoulombe/vorbis,soundcloud/vorbis,fcoulombe/vorbis,soundcloud/vorbis,fcoulombe/vorbis,fcoulombe/vorbis