Accept '==' operator in cubes dependencies
'==' is the operator used in the python dependencies specifications.
See PEP 440 http://legacy.python.org/dev/peps/pep-0440/#version-specifiers
Using the same operator in cubes dependencies allow to make setuptools handle
the cubes dependencies while keeping cubicweb happy about the dependencies.
Closes #4375144
\.svn
^build$
^dist$
\.pyc$
\.pyo$
\.bak$
\.old$
\~$
\#.*?\#$
\.swp$
^doc/book/en/apidoc$
\.old$
syntax: regexp
.*/data/database/.*\.sqlite
.*/data/database/.*\.config
.*/data/database/tmpdb.*
.*/data/ldapdb/.*
^doc/html/
^doc/doctrees/
^doc/book/en/devweb/js_api/
data/pgdb/