#179 Documented location of eclipse.ini file on MacOS

• Changes the location description in the end-user documentation of the eclipse.ini on MacOS systems.
• While I changed the location folder to eclipseESCET.app/Contents/Eclipse, the true folder depends on the version of ESCET. For example, for version 0.2, it would be eclipseESCET-v0.2.app/Contents/Eclipse. Including the version number in the documentation means that it has to be changed each time we release a new version. I'm not sure whether that is doable.

Closes #179 (closed)