Fixes bug 938410 - Fixed example in signature_history documentation.
(no bug, doc only) Fixed anchors in the middleware documentation.

Conflicts:
	docs/middleware.rst
Merge pull request #1673 from AdrianGaudebert/938410-sig-hist-doc

Fixes bug 938410 - Fixed example in signature_history documentation.
Bug 939141 - Annotate the largest free VM block in the processed crash.
Merge pull request #1677 from lonnen/largest_free_vm_block

Bug 939141 - Annotate the largest free VM block in the processed crash. r=ted
tagged logging of transaction failures with name of the resource experiencing failure.
Merge pull request #1637 from twobraids/trans-log

Fixes Bug 931147 - tagged logging of transaction failures with name of the resource experiencing failure
Fix Bug 789526, improve UI and provide user message when no data was received for graph
Merge pull request #1674 from ossreleasefeed/bug789526-non-plotted-graphs-on-topcrasher

Bug789526 non plotted graphs on topcrasher
Bug 939141 followup: don't crash on null pointers. I thought valid() was sufficient, but apparently this method can also return null.