buildrpm: enable to start the script from anywhere Previously the script worked only from the hg root.

buildrpm: warn if there is outstanding uncommitted changes

buildrpm: build from working dir parent and use hg version for RPM versioning Previous, RPMs was always built from tip, and the release number did not match the 'hg version' put in place for 1.4. This will enable also to this script to be able to build official tag and not only nightly build.

doc: fix language in CSS comments (by timeless)