0.12-rc6

fixes in this release:

do not assume that the build happens in git repo or archived git repo (#712)
left-align comments even for history view of directories (#570)
use wildcard CSS prefix matching for div id src (#716)
use correct variable name for hash retrieval (#715)

Note that there bug #718 which causes the indexer to run out of heap space (the GC does not free enough memory) which will be fixed in next release candidate.