Merge flat rate and weight quote pages into main shipping quote settings form

Patch in #1 works and is consistent with #0.

I do think this is a step in the right direction, but I miss the ability to switch between the different method configuration pages with only one click, using the secondary tabs. Now, in order to switch, I have to hit the back button then click on a different configure (or edit) link. Basically, the configuration pages have lost the context. Perhaps the "Methods" and "Settings" tabs should appear on these configuration pages, like they do on the main admin/store/settings/quotes page?

Also, the original patch has a problem - table layout breaks if a shipping method doesn't declare an "operations" key in hook_uc_shipping_method(). Image attached (using Chrome). I suspect this is because theme_links() is used to format the cell contents, and it returns '' if the links array is empty. Also, the description of hook_uc_shipping_method() in uc_quote.api.php should be changed to reflect the new keys.

EDIT: I originally said this happens in Firefox, but that's incorrect - it happens only in Chrome. Firefox behaves normally.

It may very well be a bug in the core Drupal JavaScript. I have 14 shipping methods defined on my test site. The table is displayed properly when first visiting admin/store/settings/quotes, but gets corrupted when I scroll down to see the bottom of the table. As soon as the table header reaches the top of the page, the header gets corrupted. Since this happens at exactly the time when the table header is modified to pin it to the top of the page (so it remains visible at all times, even when scrolling through large tables), and since this "pinning" behavior is something that has been messed with in core relatively recently, I suspect that's where the problem lies.

I actually see the same problem at admin/store/settings/payment. Even if you don't have a large table like I do, you should be able to reproduce this by shrinking your browser window vertically so you have to scroll to see the entire table.

I edited #2 - I had mistakenly said this happens in Firefox. That's not right - Firefox works properly. I only see this weird behavior in Chrome.

I can reproduce this with the core table at admin/config/regional/language. It seems to happen only when tableheader.js and tabledrag.js are used together. I'll search the core issue queue and file a bug there if there's not already an issue.

I'll take a look at #6 later today.

#9: 1307900-ups-usps-settings.patch queued for re-testing.

I like this better now, and it works fine.

The only thing that might be confusing to users is the difference between how flatrate/weightquote are handled and how the other methods are handled. But I think that can be fixed with a short paragraph of explanation at the top of the page. I can add that after you commit the patch if you want.

Committed.

Needs documentation of the 'operations' parameter to hook_uc_shipping_method() in uc_quotes.api.php. That looks like it is being taken care of in #1308692: Shipping quote methods should not control their own enabled and weight settings.

Also needs the above-mentioned paragraph of explanation, which I will take care of in a separate commit.