fixed bug in mtplottools in get_period, now _freq is the only local parameter to avoid mixing of freq and period
fixed bug in Z.z.set_res_phase line 567, changed array to single value as needed by propogate_error_polar2rect
added ability to plot impedances in ws3dinv
make dayfiles - memory usage optimised by replacing lists with pre allocated array

Signed-off-by: LK <LK@uni>
modemMakeData - extended period merging to evenly spaced

Signed-off-by: LK <LK@uni>
modemMakeData - extended period merging to evenly spaced

Signed-off-by: LK <LK@uni>
shifted input parameters for modemMakeData to the file s top

Signed-off-by: LK <LK@uni>