[tox] Add missing dependency on webtest for wsgi tests

[tox] Remove set of PATH environment variable The : concatenation does not work actually so the resulting PATH was just wrong (it did not contain the previous PATH). Anyways, the PATH environment variable is passed by default by tox so it's probably better to let the caller set it (thus avoiding to hard-code the specific postgres version and path). http://tox.readthedocs.org/en/latest/example/basic.html#passing-down-environment-variables

[doc] generalize info about debian/ubuntu repositories That section was not kept up to date with recent distro releases; stop trying.

[doc] fix link to setup info in README ... and fix URL to the repository's gpg key.

[server/session] remove unused cnx_meth function

[server] don't issue a warning for something expected Creating an instance happens all the time in tests, there's no reason to warn every time.

[server] stick a _cw on internal connnection's user Entity._fetch_restrictions goes through user._cw.vreg :( Closes #5705769

[migration/3.21] fix stupid error in migration script str.join doesn't like a list of ints. Closes #5706359.

Added tag 3.21.0, debian/3.21.0-1, centos/3.21.0-1 for changeset 887c6eef8077

[pkg] various fixes - add missing files to MANIFEST - exclude doc/changes from dh_installchangelogs (it's a directory, which dh_installchangelogs doesn't expect) - fix doc build in debian package