Reserved key word class in python

[sjib]

Description : class is a reserved key word in python, so we are running into conflict with python when trying to write matchings in qgepqwat2ili such as

klasse=row.class,

SyntaxError: invalid syntax

Therefore it is needed to rename all attributes "class" to "classname" in the qgep datamodel:

qgep_od.mutation.class
qgep_od.txt_text.class
qgep_od.txt_symbol.class

so that INTERLIS Export SIA405 Abwasser & VSA-DSS#15](https://github.com/teksi/teksi_wastewater/issues/31) can be implemented

Related issues :

• [x] https://github.com/QGEP/qgepqwat2ili/issues/72

Pull request:

• [x] https://github.com/QGEP/datamodel/pull/206