TST: explicit csh usage in tests
TST: replaced additional paths
DOC: updated README.txt
DOC: added simulate_ucsf example
ENH: rev parameter added which applied the reversed apodization

* `rev` parameter added to all apodization functions in proc_base.py
  which when set True will reverse the apodization window before
  applying the window.
* adjusted style in proc_base.py to meet PEP8 standard.
Code to read in Tecmag TNMR .tnt files