[params] Improve handling of parameter files
Fix #623 (closed).
If no parameter file is given look for
- executbale.input
- params.intput
If none are found, try it without parameter file. If a parameter file is given, let Dune do the error handling, and check if the file exists.
Messages are now:
- no parameter file found:
No parameter file found. Continuing without parameter file.
ParameterException [init:../dumux/io/grid/gridmanager.hh:407]: Please supply one of the parameters Grid.UpperRight, or a grid file in Grid.File ---> Abort!- parameter file doesn't exist:
Reading parameters from file bla.inpuit.
Dune reported error: Dune::IOError [readINITree:../dune/common/parametertreeparser.cc:49]: Could not open configuration file bla.inpuit ---> Abort!which I find better than before. In particular if a program doesn't need a parameter file, there is no error now.