John Cupitt c4a3e9a1a0 add VIPS_ARGUMENT_MODIFY
a flag for arguments meaning the operator will modify an input

the python binding uses this to take a copy of the arg before calling
2014-09-15 14:47:34 +01:00
..
2012-01-05 13:26:25 +00:00
2014-09-15 14:47:34 +01:00