Allow sqimap_login() to return error string when connection fails; would be nice...

Allow sqimap_login() to return error string when connection fails; would be nice if we had an error code system instead; the extent to which HTML is buried in error messages in the core like here is indicative of just how far away SM's architecture is from a good modularized system that is truly ready for t12n and a good API.

git-svn-id: https://svn.code.sf.net/p/squirrelmail/code/trunk/squirrelmail@11956 7612ce4b-ef26-0410-bec9-ea0150e637f0