Normalize test names for image-related parser tests.

Change-Id: Icbf02fc010a3a6bd0ff05cbd225941fbf5f6d891
Handle images in basic HTML better.

Properly WTS bare HTML images, like:
 <img src="File:Foobar.jpg">
and
 <a href="Bar"><img src="File:Foo.jpg"></a>

Some newly-passing tests, mostly html2wt on php tests which were never
updated for parsoid-style image output.  Other tests just change output
without being any closer (or further) from passing.

Change-Id: I2eb6b815b6dd13b550f17142e8c84956a145144a
Merge "Normalize test names for image-related parser tests."
Merge "Handle images in basic HTML better."