version 0.9.1 implement persistent connections to database with mod_perl usage

	with persistent connections sql yearly prepared used again, i.e statement is used again
	option is switched in engine script by variable $persistent_connections=1/0 1-on, 0-off

	if connnection is not used by engine in 60 second period then connection is closed, timeout is set in
	script by $persistent_connection_timout

	tested on Oracle only, other sql databases expected work correct, but who know ...

fixes debug messages
fix -C switch