Added trash files to .gitignore

editors create temporary files that we don't want committed:
.*swp
.*swo
*~
swapped the station and network names in seismogram and adjoint source files, as done by Daniel Peter in 3D and in 3D_GLOBE
Merge pull request #137 from komatits/devel

swapped the station and network names in seismogram and adjoint source files, as done by Daniel Peter in 3D and in 3D_GLOBE
removed two comments
fixed reading external models for SH simulations
fixed reading adjoint traces for SH simulations
work around integer overflow problem when writing Seismic Unix output
committed Emanuele's fix to UTILS/cubit2specfem2d/cubit2specfem2d_abs4.py
renamed UTILS/cubit2specfem2d/cubit2specfem2d_abs4.py to UTILS/cubit2specfem2d/cubit2specfem2d.py
switched to option -qstrict for the IBM xlf compiler
added autogenerated genmod files to .gitignore
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