use llrintf instead of lrintf when rounding to long long; use llrintf when converting to 24bit, rather than a cast; document the structure of the names in memops.c since they are rather mysterious
use llrintf instead of lrintf when rounding to long long; use llrintf when converting to 24bit, rather than a cast; document the structure of the names in memops.c since they are rather mysterious

git-svn-id: 9d792367086e53bac42cb25f723fe47762daf29a@3038 0c269be4-1314-0410-8aa9-9f06e86f4224

drobilla/jack1,ventosus/jack1,adiknoth/tschack,drobilla/jack1,ventosus/jack1,ventosus/jack1,drobilla/jack1,adiknoth/tschack,ventosus/jack1,drobilla/jack1