Refs #2499

along with associated classes and references thereto.

Now that we only support 64 bit we can just fall back on swap when
memory runs out.

Refs #9059

It starts by clearing the list of facilities (which contains owned pointers
to FacilityInfo objects), but didn't delete the held objects.

On a major/minor/patch build the DOI will point to release notes, and on
dev builds the DOI will point to the main mantidproject.org web page.

Updated report log to show this single DOI, and added it to the About
window too.

Hopefully it's the right patch number from CMake - need to double check
this.

Nick needs to confirm the exact wording of the message, as well as the
"desciption" field in the DOI metadata.

As commented in the code the Poco & Windows APIs are not reliable enough
to check for write permissions on a directory.
Refs #8080

The new ones are:
* python.plugin.directories
* user.python.plugin.directories

Refs #6875

If we cannot write to user configuration directory, then write
the logs to the systems temp directory.

refs #7959

The SettingsTest.py is python api version 1. In version 2, the
welcomeMessage function is no longer exposed to python

The package build throws this warning with the PythonAlgs directory.

Refs #970

Thisgs to note:
 * C2450 warnings have been suppressed when including Poco headers
   that inherit from std::stream
 * Boost date_time no longer accepts just a date for an ISO date/time
   string

The MPI build no longer logs to file by default (as this duplicates
the console channel which ends up in a log file for a job).

The format of log messages to the console has been changed to include
hostname & process id so that messages can be separated
according to which mpi rank they relate to. The rank is explicitly
logged at startup.