create a sessionid table

*implemented on 7Aug2013*

maybe maintain sessionids in a separate table so it would be possible to log into the site from more than one device at the same time.

id
userid
sessionid
createddate
status

maybe expire the sessionid after X days.

add option to config file to either maintain a single sessionid in the user table, which is how it's done now, or maintain multiple sessionids in the sessionid table.

+test+

* logging in without saving the login
* logging in with saving the login
* changing password

#junco
#resolved