Clean up and add docs to signature.test
Clean up and add docs to signature.test

VictorDenisov/librsync,librsync/librsync,binondord/librsync,librsync/librsync,dbaarda/librsync,dbaarda/librsync,yrgoldteeth/librsync,agrandville/librsync,Salamek/librsync,yrgoldteeth/librsync,librsync/librsync,dbaarda/librsync,Salamek/librsync,binondord/librsync,Salamek/librsync,yrgoldteeth/librsync,potatogim/librsync,agrandville/librsync,sourcefrog/librsync,librsync/librsync,potatogim/librsync,potatogim/librsync,VictorDenisov/librsync,dbaarda/librsync,VictorDenisov/librsync,sourcefrog/librsync,binondord/librsync,sourcefrog/librsync,sourcefrog/librsync,agrandville/librsync,VictorDenisov/librsync,yrgoldteeth/librsync