[pkg] various debian packaging fixes
- stop using *.install.in files, just use wildcards in *.install
- switch to X-Python-Version (preferred for dh_python2)
- also call dh_python2 for /usr/share/cubicweb, not just public modules
- drop long obsolete ginco and erudi migration code from cubicweb-ctl.postinst
- fix cubicweb-ctl cleanup: purge code belongs in postrm, not prerm
- don't compress changelog.html
\.svn
^build$
^dist$
\.egg-info$
^.tox$
\.pyc$
\.pyo$
\.bak$
\.old$
\~$
\#.*?\#$
\.swp$
^doc/book/en/apidoc$
\.old$
syntax: regexp
.*/data.*/database/.*\.sqlite
.*/data.*/database/.*\.config
.*/data/database/tmpdb.*
.*/data/ldapdb/.*
.*/data/uicache/
.*/data/cubes/.*/i18n/.*\.po
^doc/html/
^doc/doctrees/
^doc/book/en/devweb/js_api/
^doc/_build
^doc/js_api/
data/pgdb/
data.*/pgdb.*