hb_report: an update

• ssh tests simplified
• allow ssh with passwords
• more tests for missing files to avoid ugly screen clutter
• relax the dependency on date parsing modules
• change the top tar directory to single level
• documentation updated

Thanks to Lars for helpful comments.

Mercurial revision: 25d89e0b9f0d85e47a88d6cdd9557988f68c6d22