Emma-vis --dir parameter handling

[KGergo88]

The handling of the --dir parameter is quite strange in the Emma-vis:

• This is not a required parameter, but the memStats input files will be searched for in this folder (See helper.py::getLastModFileOrPrompt())
• If the path given in the --dir parameter does not exist, then it will be created, which does not make sense, because then it surely does not contain the memStats input files
• If no --dir is given, then it´s value will be default set to None. This leads that the os.path.join() call fails in emma_vis_libs.helper.getLastModFileOrPrompt()

TODO

• [x] Please review this part of the code and make a decision how it should be implemented
• [x] Implement the new design
• [x] Update documentation

[holzkohlengrill]

Implementation behaviour

1. If only projectDir is given: I/O path = projectDir
2. If projectDir and inOutDir is given: I/O path = inOutDir; projectDir = projectConfig
3. If projectDir, inOutDir and subDir is given; I/O path = inOutDir + subDir; projectDir = projectConfig

Implementation details:

At the end of argument parsing inOutDir and subDir get deleted. There is an additional inOutDir which contains the resulting paths according to the rules stated above.

=====

• I/O path: path containing memStats and where results will be written to
• projectConfig: all *.json configuration files