[debian] packaging fixes
* remove postgresql-contrib from cubicweb dependency (using tsearch
which is included with postgres >= 8.3)
* add postgresql-client | mysql-client to cubicweb-server dependencies, necessary
for dump/restore of database
[MESSAGES CONTROL]
disable-msg = C0301
[VARIABLES]
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additional-builtins = _, display_name
[BASIC]
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[TYPECHECK]
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