Changes:
  - any references to develop have been removed
  - pull_request builds will also build packages
Refs #10870

Conflicts:
	Code/Mantid/Build/CMake/CommonSetup.cmake
Refs #10870

Added external data support to mantid

Re-enable PeakViewer via button on SliceViewer

Fix poco 1.6.0 warnings

Feature/10555 hb2a mdws

You need to actually follow the directions [on the wiki](https://github.com/mantidproject/mantid/wiki/Building-Mantid-on-OS-X-10.9-&-10.10-using-clang-and-Xcode), but it works.

Fix some coverity issues

11004 find peaks all runs

Refs #10870

It can now be passed a directory to search for packages rather than
assuming it should look in the current directory.
Refs #10870

CMake now writes out two text files containing the location of the
data files and the requested default save directory.
The save directory now defaults to outside the source tree making it
easier to clear away.
Refs #10870

From LoadHFIRPDData

Remove setting/unsetting facility unnecessarily in indirect scripts

Refs #10869

A critical error is fixed on the run ID and detector ID in the
MDEventWrokspaces.

More unit tests are added to ensure that the rotation of the detectors
are reflected in the MDEventWorkspaces.

Property InitRunNumber is removed and replaced by using Pt. value in the
SPICE file.

Documentation is modified for better understanding.

Refs #10869