(Bug 215) Add database table for vgift transactions.

This is the last remaining table from the initial database design, which was
drafted in 2009 but not needed until now.  Some properties of the transactions
are stored in the purchase cart instead of the transaction record; I didn't
want to duplicate information, but we may want to revisit this later.

Because this is a clustered table, it is added to the list in @LJ::USER_TABLES.
There is already a key for vgifts in alloc_user_counter, so we just change it
to use the correct columns from the new table.
(Bug 215) Strip trailing whitespace in separate commit, for clarity.
(Bug 215) DW::VirtualGiftTransaction - methods for working with transaction data.

This was originally implemented in the context of DW::VirtualGift, but
as the project evolved, it was clear these would better be handled as
methods on a new kind of object representing a single vgift transaction.

Several rounds of tweaking have been incorporated into this one patch.
If anything described seems to be missing, it should show up later.
The FIXME lines in particular will go away with the addition of another
new module defining a new shop item class.
(Bug 215) New module DW::Shop::Item::VirtualGift.

This is just the shop backend. I tested it using code like this:

 my $cart = DW::Shop::Cart->new_cart;
 my %opts = ( target_userid => $u->id, vgiftid => 15, anonymous => 1 );
 my $item = DW::Shop::Item::VirtualGift->new( %opts );
 $cart->add_item( $item );
 $cart->state( $DW::Shop::STATE_PAID );  # creates transaction row
 $item->apply or warn "did not apply";   # sets status to delivered
 $cart->state( $DW::Shop::STATE_PROCESSED );  # housekeeping

Seemed to work OK; hopefully this means it will integrate seamlessly with the
shop engine when the time comes.  I left in a FIXME to remind me to check and
make sure name_text/name_html do what I expect in context later, and to fire
a notification when the gift is delivered.

I also changed DW::Shop to use LJ::ModuleLoader instead of having to write out
each individual subclass of DW::Shop::Item and keep it updated.
(Bug 215) New event for virtual gift delivery notification, LJ::Event::VgiftDelivered.

All the fun stuff that comes with ESN.  This has primarily been tested via
/admin/eventoutput.  The link on /manage/settings should maybe not go
live yet, as it's mostly just for testing at this point.
(Bug 215) Add vgift-trans.t for testing transaction methods.

Writing a test seems so easy on the surface... until running it
turns up all sorts of weird bugs in the code... some of them
I was able to fix and others I just had to work around.
(Bug 215) Add methods related to viewing transactions on profile pages.

Not strictly backend, but defining here for convenience.

There is a new transaction URL method which resolves to
http://$username.dreamwidth.org/vgifts/$transid, but that
will 404 until the new controller is ready.
(Bug 215) Requested code style tweaks.
Bug 5041 Include comments search in S2 search module

Simplified and corrected  fix.
Print_search_form method checks if comments are indexed here,
if so adds a "with comments" checkbox.
Currently comments are indexed if the journal being viewed is paid.
(Bug 5041) Include comments search in S2 search module

Style fixes as per review comments.
Text box, comment search checkbox and Search button  on separate lines
Bug 5041 Include comments search in S2 search module

Each element of the form is now in a separate span
which can be styled inline or block.
Appropriate CSS in Tabula Rasa, fix for WideOpen.
Still to do: - check if any other TR children need overrides
- add CSS for non-TR layouts
(Bug 5041) Include comments search in S2 search module

CSS added for Abstractia, Bases, Brittle, Drifting
Negatives and Skittlish Dreams
which don't inherit from Tabula Rasa.
(bug 5283) Convert changeemail.bml to TT

Converts changeemail.bml to TT.
(Bug 5073) New account links layout for Foundation

* Splits up the way the account links area renders
  for the old Tropo and new Foundation layout
* Turns logging in into a modal
(Bug 5073) Further progress on Foundation masthead

* Modal now activated by clicking username on left side
  of menu bar
* Small icon version in masthead on small screens
* No icon in modal
* Smaller text for quick links so they are not as overwhelming
  and don't overlap with logo on medium screens
(Bug 5073) Don't replicate account link HTML

Figured out a way to make the account link text into
a modal without replicating the account link. This involved
applying the reveal CSS to the account-link-text ID ONLY
when the screen is small.  Additionally, add a close reveal
link that is hidden when the page is medium/above.

The ONE problem this has is very small:

When resizing the screen to small, activating the modal, closing
the modal, then resizing the screen to large, the account
links do not appear again.  However, this is a very small
problem that probably will not be too hard to fix if necessary.
(Bug 5073) account link access link always unvisited link color
(Bug 5073) Reveal CSS needs to be available
(Bug 5073) Redefine row width for Foundation

Back when tropo was .9em the page width was set to 80em.
However, translated to 1em that mean 64em wide instead.
(Bug 5073) Finesse login links and buttons

* On mobile, put login link in menu bar
* On desktop, login link is button in masthead
* For link buttons, retain the primary text color
* For secondary link buttons, retain text color
* Add primary-text-color for lynx
* For login form, realign columns