(Bug 4532, 5142, 5143) Convert /feeds - remove raw.bml

This isn't serving a useful purpose, so remove it and redirect to /feeds/list.
(Bug 4532, 5142, 5143) Convert /feeds - new function LJ::Feed::synrow_select

Refactored repeated raw SQL statement from index.bml into new function
in LJ/Feed.pm for better maintainability.  Also fixed a warning
"uninitialized value in subtraction" in a different section of Feed.pm.
(Bug 4532, 5142, 5143) Convert /feeds - remove LJ::Syn module

Between LJ::Feed, LJ::Syn, and LJ::SynSuck, I really felt like we had
too many code modules related to feed management, so I merged LJ::Syn
into LJ::Feed.
(Bug 4532, 5142, 5143) Convert /feeds - move BML files to DW::Controller::Feeds

Three new templates: /feeds/index, /feeds/list, and (interstitial) /feeds/name