begin attachments class
continue attachments stuff
update config.example.php to reflect recent changes

Also move comment to proper position in sendmail.php
Ensure that $attachEnabled is set to true before attempting file actions
in send.php and sendmail.php
if $attachEnabled is false, then $file must be NULL
there remains an issue with viewfile
don't use location.reload

location.reload will keep current parameters (such as ?notice) which
then results in the notice message being showed on page reload.

Also checking if $file is empty is useless as it never (should) be.
fix issue with file link

Check if $file is essentially blank, and if so, don't append the file
link.
Merge pull request #3 from TripleJay34/dev-attachments

Add attachments feature