* Auto-detects if form is 'compose.php' and if PHP is giving us bad form

* Auto-detects if form is 'compose.php' and if PHP is giving us bad form
  data and will only trim when appropriate (the multipart/form-data form)
* Trimming method doesn't eliminate extra newlines -- just the first one.
* Cleaned up the code a bit.

* This code should be removed somewhat soon after RedHat officially releases
  a good binary package and after Konqueror works.

git-svn-id: https://svn.code.sf.net/p/squirrelmail/code/trunk/squirrelmail@1069 7612ce4b-ef26-0410-bec9-ea0150e637f0