Python3 compatibility tests

module	result
annlib	✅  all OK
boost	🔴  1 files violate python3 syntax
cbflib	🔴  24 files violate python3 syntax
ccp4io	✅  all OK
cctbx	✅  all OK
chiltbx	✅  all OK
cma_es	✅  all OK
crys3d	✅  all OK
dials	✅  all OK
dials_research	✅  all OK
dlstbx	✅  all OK
dxtbx	✅  all OK
fable	✅  all OK
gltbx	✅  all OK
iota	✅  all OK
iotbx	✅  all OK
libtbx	✅  all OK
mmtbx	✅  all OK
omptbx	✅  all OK
prime	✅  all OK
rstbx	✅  all OK
scitbx	✅  all OK
simtbx	✅  all OK
smtbx	✅  all OK
spotfinder	✅  all OK
tbxx	✅  all OK
ucif	✅  all OK
xfel	✅  all OK
xia2	✅  all OK