updated BOAST sources to support version 0.9995+
Merge branch 'devel' of github.com:Nanosim-LIG/specfem3d_globe into devel
removed src/auxiliaries/combine_vol_data_shared.f90, which contained routines duplicated from other files of the code (that is dangerous, and very uneady to maintain the same routines twice, in two different files of the code).
Thus temporarily had to comment out xcombine_vol_data* from Makefile.in and from src/auxiliaries/rules.mk because I do not know how to fix the Makefile (probably not difficult, but I am not familiar with that).
Also removed unused variables introduced by the CEM modification a few days ago.
Added comments for ellipticity.
Removed useless white spaces using a cleaning script.
Merge pull request #222 from komatits/devel

removed src/auxiliaries/combine_vol_data_shared.f90, which contained routines duplicated from other files of the code (that is dangerous, and very uneasy to maintain the same routines twice, in two different files of the code). Thus temporarily had to comment out xcombine_vol_data* from Makefile.in and from src/auxiliaries/rules.mk because I do not know how to fix the Makefile (probably not difficult, but I am not familiar with that). Also removed unused variables introduced by the CEM modification a few days ago. Added comments for ellipticity. Removed useless white spaces using a cleaning script.
build: Update rules for auxiliaries without duplicate code.
build: Split auxiliaries rules by executable.

This does make the rules file a bit longer, but I hope it's clearer to
other people what's going where this way.
build: Add ellipticity files to xcombine_vol* programs.
Merge pull request #224 from QuLogic/auxiliaries-build-rules

Updated auxiliaries build rules
build: Split regular and optimized compiler flags.

Currently, doesn't do anything but split them up for future use.
build: Add --enable-debug option to configure.

At the moment, this only switches from optimizing options to debugging
options.
build: Automatically disable vectorization with debug.
Merge pull request #225 from QuLogic/debug-config

Add debug config option
build: Add shared module to auxiliaries compile.

This problem seems to affect PGI only. I guess all the other compilers
optimize and fold the constants in, but PGI still requires the constants
module to link everything.
Removed direct usage of BOAST state
Added function declarations
Fix a couple minor typos.
Fixed a little bug in --with-cem compilation