added a sentence about Zlib -lz to the users manual
Merge pull request #23 from komatits/devel

added a sentence about Zlib -lz to the users manual; can be merged in "master" as well because only the users manual has changed
renamed QUART to QUARTER
Merge pull request #24 from komatits/devel

renamed QUART to QUARTER
- added a print statement to prepare_color_image if the code detects that the image is too big
- increased the image size limit to 10000 pixels in each direction
- added a small Fortran program to create a pseudo plane wave source based on tapering with a Hamming window
- fixed the "Number of absorbing elements" print statement bug: this should not be printed when PML is on
Merge pull request #25 from komatits/devel

- added a print statement to prepare_color_image if the code detects tha...
removed USE_GUENNEAU
removed USE_GUENNEAU
Merge pull request #26 from komatits/devel

Devel
suppressed ipass, PERFORM_CUTHILL_MCKEE, ACTUALLY_IMPLEMENT_PERM* and FURTHER_REDUCE_CACHE_MISSES, which were making the code too complex with no significant performance improvement. Also suppressed GENERATE_PARAVER_TRACES, which is not used any more.
Merge pull request #27 from komatits/devel

suppressed ipass, PERFORM_CUTHILL_MCKEE, ACTUALLY_IMPLEMENT_PERM* and FU...
removed CUTHILL_MCKEE from DATA/Par_file, removed unused variables at the end of setup/constants.h.in, and created an empty OUTPUT_FILES/ directory because it is required by the solver
Merge pull request #28 from komatits/devel

removed CUTHILL_MCKEE from DATA/Par_file, removed unused variables at th...
fixed some typos found by Alexis Bottero
Merge pull request #29 from komatits/devel

fixed some typos found by Alexis Bottero
better (more general) implementation of periodic boundary conditions;
currently work fine for elastic media and serial simulations only,
will add support for acoustic media and for MPI later
Merge pull request #30 from komatits/devel

better (more general) implementation of periodic boundary conditions;
added support for acoustic media for periodic boundary conditions
Merge pull request #31 from komatits/devel

added support for acoustic media for periodic boundary conditions
added a comment in DATA/Par_file, and fixed a typo in src/specfem2D/specfem2D.F90