Only create db directory if it does not yet exist.
Update about page for buildfarm to mention sources are now in Git.
Add some notes on running the build farm locally to README.
Simplify handling of old build limit showing.
Add --debug-storm option.
Merge git://git.samba.org/build-farm into newlook

Signed-off-by: krishnatejaperannagari <krishnatejaperannagari@gmail.com>