Exception origin info function trace.location()
Plugs bootstrap process reworks and cleanups

support env variable COMINE_PLUGS pointing to directory with
custom plugins. This plugins are loaded with new command:

	comine boot [ reload ]

or during regular open, attach commands.

reload modifier instructs plugin manager to reload all plugins
again. On default only new plugs will be loaded.
Helper utility for bootstrapping comine env in gdb
Improved standard layout disq and maint commnads
Known bugs db impl and checker against runtime ver