[web/views] use next builtin instead of next method

[py3k] declare meta classes using six.add_metaclass

[py3k] replace '_ = unicode' in global scope (closes #7589459)

[py3k] introduce cubicweb._ (related to #7589459) The end goal is to stop relying on '_' being in the builtin scope. In the mean time, deprecate the builtin '_' so that consumers are warned.

[py3k] dict.iterkeys → dict

[py3k] dict.itervalues → dict.values

[py3k] dict.iteritems → dict.items

implement __ne__ whenever we implement __eq__

[test] use unicode for rql queries (7/7) Closes #6694446

[test] use unicode for rql queries (6/7) Related to #6694446

[test] use unicode for rql queries (5/7) Related to #6694446

[test] use unicode for rql queries (4/7) Related to #6694446

[test] use unicode for rql queries (3/7) Related to #6694446

[test] use unicode for rql queries (2/7) Related to #6694446

[test] use unicode for rql queries (1/7) Related to #6694446

[schema] improve normalization of RQLExpressions Parse and print back the expression instead of manipulating the string. Among other benefits, it means we don't mangle embedded string constants that contain commas or multiple spaces. Closes #6694426

[server/rql2sql] use VariableRef.is_equivalent explicitly instead of relying on __eq__ What we want to compare is the variable referenced by the VariableRef, we should make that explicit. Closes #6694406

merge with 3.21.2

[statsd] fix the statsd logger (closes #7558147) socket.inet_pton's second argument is the ip, not a couple (ip, port)

Added tag 3.21.2, debian/3.21.2-1, centos/3.21.2-1 for changeset a5428e1ab364

[pkg] 3.21.2

[pkg] Remove leftover dep on pyro (closes #7479155)

merge with 3.20.10

[migration] fix change_attribute_type to update the live schema Closes #7170830

[devtools] add has_cache for postgres (closes #5739624) devtools stores info about existing dbs in the db handler, but in the case of postgresql that doesn't take into account the path to the cluster's datadir. Which means if we run two test modules (in the same test run), we'll create a "__default_empty_db__" for the first one, cache its existence, and then when moving on to the other module, believe the template already exists (but since the datadir depends on the test module's path, it does not). This patch is a bit of a kludge, and it would be better to make the cache key include enough data to not need this, but I'm not sure how to do that.

fix bad-caching of datetime with tz info at sql generation time There is a special handling for datetime with tzinfo, where value was stored in the query cache. The implementation of merge_args was simply overwriting parameters of the query with those in the query cache, expecting no collision. To fix this: * handle replacement of tzinfo in merge_args, not at sql generation time * add an assertion to ensure we've actually no collision Closes #6978316

Added tag 3.20.10, debian/3.20.10-1, centos/3.20.10-1 for changeset 8f82e9523962

[pkg] 3.20.10

merge with 3.19.13

[devtools] Fix CubicWebTC.temporary_permissions If the context manager is exited via an exception, the original permissions should be restored.