pt.py & z.py - removed ambiguous frequency attributes - all named freq now

Signed-off-by: LK <LK@uni>
pt.py: renamed set_z into set_z_object for clarification

Signed-off-by: LK <LK@uni>
edi.py : Tipper attribute is initialised - its attributes are NONE, if tipper is not present

Signed-off-by: LK <LK@uni>
edi.py : INFO changed into non-mandatory section

Signed-off-by: LK <LK@uni>
utils: removed latlongutmconversion.py (contained in conversions.py ) and combineedis.py (contained in EDI)

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