Run command fail if input file is recognized as TOUGH2 (instead of AUTOUGH2)

[Angus Yeh]

At the moment simulator executable is hard-coded, using AUTOUGH2_5_teaching.exe. And dat.type is not checked before dat.run() is called.

So if an input file is considered as TOUGH2 (dat.type='TOUGH2'), it would be run using the wrong executable and execution method. A check is required before running.

Also in the future, it would be necessary to have two TIM settings, SIMULATOR_AUTOUGH/SIMULATOR_TOUGH2.

[Angus Yeh]

Thanks Eylem for reporting this bug.

[Angus Yeh]

Additionally, it is curious what AUTOUGH2 would actually run if SIMUL is missing (hecen recognised by PyTOUGH as TOUGH2 input file.) It ran, but I am not sure about the numerics.