core: tools.utils.getRepositoryData now return "hg log -r -1" and short form of node + fixed crash if mercurial is not present: short form is now returned in string version for better readability. Even if a collision is possible, it's not a big deal as it is used mainly in about dialog to help identify a version in case of e.g. bug.

Use this module to temporary store files that need to be integrated to other
projects such as Wokkel.

For example, the changeset that introduced this folder adds RSM (XEP-0059)
support to Wokkel. The files in sat.tmp.wokkel are imported over the initial
wokkel files from sat.plugins.__init__.py