added spatial static shift correction to analysis and fixed z.no_ss so that both x and y are corrected for, and no need to change z_err with static shift.
more sophisticated handling of coordinate formats in format.py

Signed-off-by: lasse <lasse@nalle.(none)>
more sophisticated handling of coordinate formats in format.py - merge corrected

Signed-off-by: lasse <lasse@nalle.(none)>
Merge branch 'lk.occam' of github.com:geophysics/mtpy into lk.occam