Merged in changes from tblog-2-branch:
Move parts of libtblog into libtblog_simple. Libtblog simple provided the basic logging functions but doesn't touch anything. Moreover including libtblog_simple doesn't automatically start the logging subsystem. It also doesn't have testbed dependencies which mean 1) it can be used in the core testbed libraries (such as libdb, libtestbed) without introducing a circular dependency and 2) can be used independently. Reworked DBFatal and DBWarn to use tblog. It will still email testbed-ops, however. Make use of the "cause" field to determine the cause of the bug. In particular tblog_find_error will look at the value of this field and report the "cause". In the future different actions can be taken based on the ultimate "cause" of the bug, such as if testbed-ops should be notified. Change format of Error Message reported by libtblog. As per the email "Format or Error Messages" ro testbed-dev. Have libtblog use its own Database handle to avoid problems with locked tables. Also set DBCONN_MAXTRIES to 3 for most important queries. For queries that are not important don't send mail on error.
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