Set Verbose logging by default

This makes the log files tremendously more useful and does not add
much more overhead overall.
Merge pull request #153 from dirkmueller/verbose

Let's try verbose for roxy, and revert if we're not happy.
Hide use_syslog option from UI

I don't see any reason to expose it.
Improve barclamp description
Merge pull request #163 from vuntz/improve-description

Improve barclamp description
Merge pull request #162 from vuntz/no-use-syslog

Hide use_syslog option from UI