This should fix issue 872 where mounted shares are not visible on Mac

Now there is a link to the online documentation

This addresses issue 834: files that will be read from a METEOPATH
should be stripped of their path otherwise the path appears twice. On
the other hand, this means that since there is no link to the METEOPATH
(or similar variable), we don't know which directory the files belong
to, so we can not validate anything (beside non-empty file name). This
is better than generating a wrong configuration file but still not
perfect...

Noteworthy: Removed fixed shortcut in doc because it is OS-dependent.

Wrong (non-interactive) panels were passed to the INIParser. Not grave because the value
would be empty, but still this was fixed. In fact, start removing IDs
from non-interactive panels. They were given in the beginning so that
specific elements could be targeted, but this was never needed. So now
there's less object IDs flying around. There are probably more that will
be cleaned when stumbled upon, until then they do no harm.

Wrong (non-interactive) panels were passed to the INIParser. Not grave because the value
would be empty, but still this was fixed. In fact, start removing IDs
from non-interactive panels. They were given in the beginning so that
specific elements could be targeted, but this was never needed. So now
there's less object IDs flying around. There are probably more that will
be cleaned when stumbled upon, until then they do no harm.

More end user friendly 'unknown INI key' log message, don't warn of misformated INI files if it's only a harmless whitespace.

Replacing assignement operators by direct assignement in constructor and some constification

The color scheme has been redesigned and now follows Solarized (https://en.wikipedia.org/wiki/Solarized_(color_scheme)). Instead of directly coding colors in the code, they have all received symbolic names and then the names are mapped to a specific color. On the long term, we will be able to offer several color schemes, like Solarized, osX, Windows, etc

Slight modifications to improve macOS integration; most importantly we shouldn't set hardcoded button sizes

re-check on onPropertySet when the value does not actually change.

Some comments.

Add flexibility to Grid panel (auto-choose row/col, rowspan, colspan, safety checks). Only search for MainWindow once for logging, better XML errors.