Modelica.Utilities.Files.createDirectory fails if the directory does not exist

[sjoelund]

Modelica.Utilities.Files.createDirectory calls fullPathName, which fails if the path does not exist (on Linux). This means createDirectory does not work. Some possible solutions:

• Change fullPathName to never fail (revert to the old code with getcwd)
• Change createDirectory to not call fullPathName (but this would not fix older MSL versions)
• Add an argument to fullPathName to not fail (return the input perhaps), and create this additional file in the external sources

[beutlich]

Bug has been around for 7 years. If it is okay for you, I think we should revert 75d86f3 (the realpath part) then.

[sjoelund]

I think it would be nicer to just see if the result is NULL and then use the old code. That shouldn't be very difficult to add. Otherwise the functionality is also very different in Linux and Windows since ../ would never be replaced