[JobQueue] Added more isQueueDeprioritized() checks to avoid refreshLinks spam.

Change-Id: I29cb22ed471f129efba2bb7b0743c700456f0f4d
Fix link target and retina thumbnails for manual thumbnails. (Bug 45405.)

The output for [[Image:Bad.jpg|thumb=Foobar.jpg|Title]] used to be:

<div class="thumb tright"><div class="thumbinner" style="width:1943px;"><a
href="/wiki/File:Foobar.jpg" class="image"><img alt=""
src="http://example.com/images/3/3a/Foobar.jpg" width="1941" height="220"
class="thumbimage" srcset="http://example.com/images/0/09/Bad.jpg 1.5x,
http://example.com/images/0/09/Bad.jpg 2x" /></a>  <div
class="thumbcaption"><div class="magnify"><a href="/wiki/File:Bad.jpg"
class="internal" title="Enlarge"><img
src="/skins/common/images/magnify-clip.png" width="15" height="11" alt=""
/></a></div>Title</div></div></div>

Note that the target of the <a> is the thumb, not the original image,
and that the srcset is loading the full resolution version of Bad.jpg.

The attached patches fix the link target and srcset issues
(suppressing the srcset when a manual thumb is used).  It also adds a
new "Thumb.png" pseudo-file to the parserTests so that we can write
new tests documenting how manual thumbnails are expected to work,
and adds the 'php' option to the thumbnail tests (since the Parsoid
parser generates different output).

Change-Id: I5be80bfce855b85f9debf3ef1776b877d1f84b9f
WebRequest::getRequestURL: Follow up Ibe00a6b8

* Only match consecutive slashes at the beginning of the URL, where
  they are actually a problem.
* Fix bug 46607 in cases where the server provides an absolute URL.

Change-Id: Ibe00a6b8722786170d09b846c1c4054b73da3d9e
Merge "[JobQueue] Added more isQueueDeprioritized() checks to avoid refreshLinks spam."
Merge "Fix link target and retina thumbnails for manual thumbnails. (Bug 45405.)"
Merge "WebRequest::getRequestURL: Follow up Ibe00a6b8"