templatekw: use literal set syntax According to https://www.mercurial-scm.org/wiki/SupportedPythonVersions, we don't support Python 2.6 since 4.3.

obshistory: remove obsfateverb/obsfateprinter patching compatibility obsutil.obsfateverb() was introduced in 3d0f8918351b (hg 4.4) and renamed in b81ad5b78a81 (hg 4.5). Considering the supported evolve versions, the first check is unnecessary (the condition is always True) obsutil.obsfateprinter() was introduced in e27f1f04c2cf (hg 4.4).

obshistory: drop unused keyword argument to _getobsfateandsuccs()