[Bug 1874] See who's in a particular custom filter when posting

Conflicts:
	htdocs/js/jquery.postform.js
[Bug 1874] improved query methodology, closed some security holes and
added some error/sanity checking.  Also now sorts the final list.
removing superfluous <div>
(bug 2288) move checkforusername to routing

This wasn't a true __rpc_... endpoint, now it is
(Bug 4176) Support notifs should include username

Notifications of new support requests now contain the username or
(for logged-out requests) name provided by user. Notifications of
follow-ups to support requests now contain the username of the
person who left the response. I do not allow for anonymous follow-
ups because as far as I can tell they can't happen.
Merge pull request #455 from woggy/thisisatestbranch

[Bug 1874] See who's in a particular custom filter when posting
Merge pull request #466 from anall/feature/bug2288-checkforusername

(bug 2288) move checkforusername to routing
Merge pull request #427 from kaberett/bug4176-support-username

Bug4176 support notifications should include username
(bug 4907) Enable redirection for ios homescreen icons in S2

Added configuration instructions in doc/config-local.pl.txt
with commented-out version which works with current dw install.
Header linkref for ios homescreen icon is added if config
variable is present in any page served through S2.
Merge pull request #465 from dwmc15873/bug4907-ios-icon

(bug 4907) Teach S2 to serve up icons for iOS