started adding other modes for birrp

Signed-off-by: LK <LK@uni>
this branch includes tools for usgs equipment
corrected typo in edi.py - made it impossible to write edi files

Signed-off-by: LK <LK@uni>
Merge branch 'lk.trace'

Conflicts:
	mtpy/processing/birrp.py

Signed-off-by: LK <LK@uni>
corrected coil calibration files for missing factor 2

Signed-off-by: LK <LK@uni>
corrected (squared) error handling in edi.py: internal errors are std deviations, but EDI files hold variances

Signed-off-by: LK <LK@uni>
updated some files, added write survey_config file to configfile, added ws3dtools
added folder called usgs that might be useful to future users
Adjusted setup.py to include folder usgs for installation
added tools for average files, cache files
convert_birrp_output - coherence files - corrected for absolute pathnames of files

Signed-off-by: LK <LK@uni>
Merge branch 'master' of github.com:geophysics/mtpy
added script for converting EDI files into kml to show locations in googleearth

Signed-off-by: LK <LK@uni>
fixed a bug in occam and added to zentools
added script plot_stationmap_from_edis, which generates simple overview maps - needs Basemap module!

Signed-off-by: LK <LK@uni>
Merge branch 'master' of github.com:geophysics/mtpy
updated plot_pt_pseudosection and zentools
Merge branch 'master' of https://github.com/geophysics/mtpy
updated zentools