Fix comp_in_new: make outputing the compose link a function so that

Fix comp_in_new: make outputing the compose link a function so that
the comp_in_new works the same everywhere.
In this new function, make sure that comp_in_new still works when
JavaScript off.
When JavaScript off, do not output all kinds of JavaScript functions
which are never going to be called.

git-svn-id: https://svn.code.sf.net/p/squirrelmail/code/trunk/squirrelmail@4977 7612ce4b-ef26-0410-bec9-ea0150e637f0