changed the number of iterations from 4 to 5
removed see_also_README_inversion_package_list_of_things_to_do_in_the_SPECFEM3D_package.txt
major restructuring by Etienne Bachmann: use modules instead of subroutine arguments, as in the 3D codes; this drastically simplifies the source code and is much easier to understand and maintain
cleaned the Par_files
moved UTILS/thermocline to EXAMPLES/thermocline
Added an example of the use of AXISYM option
Changed "echo `date`" to "date" which is actually the same
Merge pull request #156 from bottero/devel

I added an example of the use of AXISYM option
renamed EXAMPLES/ExampleAXISYM to EXAMPLES/axisymmetric_case_AXISYM_option
added Paul Cristini's Python script to generate a thermocline
Merge pull request #158 from komatits/devel

added Paul Cristini's Python script to generate a thermocline
suppressed the "configure" and "make" steps from all the run_this_example.sh
added two missing parameters in src/specfem2D/define_external_model.f90, and fixed a minor bug in src/specfem2D/read_external_model.f90 when detecting if an element is both fluid and solid
updated two comments
added write_output_SU.f90
refactored write_seismograms
refactored write_seismograms