Merge release-4-6 into master

Merge release-4-6 into master

Conflicts:
	src/mdlib/CMakeLists.txt
          change applied to src/gromacs/mdlib/CMakeLists.txt
	src/tools/gmx_tune_pme.c
	  trivial conflict

Moved:
	src/mdlib/fftpack.c & src/mdlib/fftpack.h to src/external/fftpack

Fixed paths in COPYING-OTHER and added boost and gtest/gmock.

Moved the copyright header and list of modifications from fftpack.c into
new README file. Reduces modifications to original file.

Fixed header location in src/gromacs/mdlib/gmx_fft_fftpack.c.

Added macros.h to g_tune_pme (fixing missing min/max)

Change-Id: I9324b1695412e21d16bdcb4d2dc316c53356da5f