Ah, regarding GitHub numbers: I have just added an entry to http://en.opensuse.org/openSUSE:Packaging_Patches_guidelines#Current_set_of_abbreviations following a short discussion on http://lists.opensuse.org/opensuse-packaging/2013-06/msg00032.html . So I propose:

```
... Use the format #42 (see [autolinked GitHub references](https://help.github.com/articles/github-flavored-markdown#references)) or bnc#775814 if you don't want to type the whole URL. OTOH in SUSE *.changes files, use gh#yast/yast-foo#42 ([other tags](http://en.opensuse.org/openSUSE:Packaging_Patches_guidelines#Current_set_of_abbreviations)).
```

Fortunately Brent Chun https://github.com/bnc has no clones of our repos :D