Drop rsum.c; move all operations into rdiff.c.
Drop rsum.c; move all operations into rdiff.c.

yrgoldteeth/librsync,dbaarda/librsync,dbaarda/librsync,sourcefrog/librsync,agrandville/librsync,sourcefrog/librsync,binondord/librsync,yrgoldteeth/librsync,pauloppenheim-liveloop/librsync,binondord/librsync,pauloppenheim-liveloop/librsync,dbaarda/librsync,VictorDenisov/librsync,pauloppenheim-liveloop/librsync-winbuild,pauloppenheim-liveloop/librsync,agrandville/librsync,Salamek/librsync,potatogim/librsync,potatogim/librsync,VictorDenisov/librsync,pauloppenheim-liveloop/librsync-winbuild,librsync/librsync,potatogim/librsync,agrandville/librsync,VictorDenisov/librsync,librsync/librsync,yrgoldteeth/librsync,sourcefrog/librsync,Salamek/librsync,dbaarda/librsync,sourcefrog/librsync,librsync/librsync,binondord/librsync,VictorDenisov/librsync,yrgoldteeth/librsync,Salamek/librsync,librsync/librsync,pauloppenheim-liveloop/librsync-winbuild