fixed tutor combo list

also made frmMain use DataConnection class
Finished implementing DataConnection
11/15

edited main form sign out
nothing
Merge remote-tracking branch 'origin/Matt8'

Conflicts:
	CIS411_Kris/db.mdf
	CIS411_Kris/db_log.ldf
	CIS411_Kris/frmAdmin.cs
	CIS411_Kris/frmMain.cs