default directory for choosing kml overlay files

[Jens-Uwe Grooß]

In the menu point KML overlay, a file can be chosen. The default directory is now that from which the mss UI has been started, e.g. .../mss/mslib/msui It would be better, if the default directory is remembered in the configuration file mss.topview.cfg from the last call or could be set in the mss_settings.json file

[Jens-Uwe Grooß]

The current version mostly solved this issue. The last used kml file is saved. Somewhat better would be, if also the directory first displayed when hitting the [...] button would be saved.

[Reimar Bauer]

Use directory of KML file for picking new KML file

Also fix bug in satellite track settings.

Resolve issue #145

→ <<cset 730bba2cc6b1>>