Remove 9.0 from the list of postgresql versions available in ports
Disconnect postgresql90 ports from the build
Remove postgresql90-pgtcl port
Remove postgresql90-client port
Move the master postgreslXY-plperl makefile to postgresql95-plperl/Makefile.
Adjust include lines in other postgresqlXY-plperl ports
Delete postgresql90-plperl
Move the master postgreslXY-plpython/{Makefile,pkg-descr} to
postgresl95-plpython/{Makefile,pkg-descr}
Adjust all other postgresqlXY-plpython/Makefile to include the new master
Remove postgresql90-server