Allow non-http(s) URLs as source of files

The current code checks, if the provided "domain" begins with http:// or https:// -- and prepends "http://" if it does not.

I wish, it made no such check at all -- garbage in, garbage out. But, if a check is needed, I propose it be relaxed -- don't modify user's input, if the entered string contains "://" anywhere in it.

This allows, for example, a URL like file:/// -- which is fantastically faster than downloading files from a web-server (even from localhost). Other obvious alternatives may be rsync://, or ssh:// -- or whatever else the local php installation is prepared to handle.

I personally used file:/// -- and I wish, the module had more shortcuts for that fairly common case, when the Drupal and the phpBB versions of a site are hosted on the same box.

This would also resolve the Phpbb files location bug issue, BTW.

--- phpbb2drupal/phpbb2drupal.pages.inc.orig    2013-02-04 11:56:17.000000000 -0500
+++ phpbb2drupal/phpbb2drupal.pages.inc 2014-01-24 22:58:55.000000000 -0500
@@ -297,5 +297,5 @@
   }
 
-  if (drupal_strlen($domain) > 0 && !preg_match('/^http(s)?:\/\//i', $domain)) {
+  if (drupal_strlen($domain) > 0 && !preg_match('/:\/\//i', $domain)) {
     $domain = "http://{$domain}";
   }