Update modelica system (#277)

* [ModelicaSystem] remove not needed variables

* [ModelicaSystem] csvFile

* [ModelicaSystem] tempdir

* [ModelicaSystem] batFilePath

* [ModelicaSystem] fileName / lmodel

* [tests] fix definition of lmodel - should be a list

* [ModelicaSystem] resultfile

* [ModelicaSystem] check session

* [ModelicaSystem] remove _check_error()

* [ModelicaSystem] static strip_space()

* [ModelicaSystem] exception handling

* [ModelicaSystem] remove _raise_error()

* [tests] remove raiseerror=True

* [ModelicaSystem] remove verbose - use logger.debug

* [ModelicaSystem] check that lmodel is defined as list

* [ModelicaSystem] remove OMCSessionException for now

Author: syntron