Support DISPLAYTITLE in article view

Added support for the display title. Limited this to
article view as this seems to be the consistent behavior
across platforms. There was actually a field for this in the
article model, but it was apparently never fully implemented.
Perform nil check when create dictionary in
DownloadSectionsOp.m, and in getHeaderTitle
Section+DisplayHtml.m.

Bug: 63971
Change-Id: I26fe6d723540b67da533e6b916a6a288a4ddc4c9
Prevent app from using css if 200 response but error message found.

Change-Id: I58462c3a20f96df4411f444e049a441c92007aec
Merge "Prevent app from using css if 200 response but error message found."
Fix for occasional crash when clearing saved pages.

Change-Id: I828294b6e0515d4a2d307a833581a5d0ea7de6f9
Fix for infobox relocation leaving parent table with empty space.

Relocates the most distant ancestor table encountered before the
content_block_0 div is encountered. If no parent tables found it
just moves the infobox the same as before.

Change-Id: Id4733126aa843680869da47cc027f161b77e7262