Use GLib's i18n support instead of copying and pasting that
logic into its own header. This deprecates the vips/intl.h
header in favour of glib/gi18n.h.
vips_math2_const(), vips_boolean_const() and vips_relational_const() had
the const and oper args reversed from the Python/CLI/C++ API
add something to check for arg priority conflicts and resolve the
conflicts it found
Kleis Auke Wolthuizen
Alistair Thomas
John Cupitt