Reverted the init.php requirement. Marc raised some good points about init.php doing...

Reverted the init.php requirement.  Marc raised some good points about init.php doing work regarding preferences et al, more in line with a logged-in-user.  In order to avoid future complications, I have removed init.hp from configtest, and have replaced the missing require(). (global.php and strings.php)

Also added a non-fatal test for register_globals.

git-svn-id: https://svn.code.sf.net/p/squirrelmail/code/trunk/squirrelmail@11028 7612ce4b-ef26-0410-bec9-ea0150e637f0