fixed a bug in the _set_rot_z
Fixed a few bugs in birrp, filehandling and mseed, added write_script_file in birrp and changed read_ts_header in filehandling to return floats of numbers instead of strings.
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>