Delete unneeded images.

Images used to generate effects now done in CSS no longer needed.  Also
delete images used for D2 and Firehose.
Merge branch 'master' into messages
update links to point to /my/inbox

Message links were set to messages.pl?op=list, and since the default op
is now show, just set the links to go to /my/inbox.
Merge pull request #191 from paulej72/messages

update links to point to /my/inbox for userboxes template
Merge pull request #190 from paulej72/unneeded_images

Delete unneeded images.
add in call for email_footer template

Footer contains can_spam act message that needs to go out on bulk email
messages.
Merge pull request #192 from paulej72/messages

add in call for email_footer template
Merge remote-tracking branch 'upstream/master' into submissions