Better tracking for items recorded (no more duplicates)

[admin]

Helene modified "wassupAppend" function to include the following "session"-related changes: a) Added a new exclusion control that uses "session" to identify and weed out duplicate records. b) Changed "wassup_id" so that it is no longer a random number but is a combination of date/hour/min/ip/spider/browser/os/userAgent. It is not unique so that multiple visits from the same ip/userAgent within a 10 minute-period, will be identified as such, even when session/cookies is disabled. This id is md5 encoded then saved in "session" and in the "wassup" table. c) Added a test for existance of "session_save_path" directory before starting session to minimize errors due to invalid paths.