Add the "moving" grib file option  from Saildocs

In the request dialog , a button "moving grib enable" / "moving grib disable" is displayed if Saildocs is the choice.
Clicking on this button opens a pop-up allowing to enable/disable the moving grib request and enter speed and course.
The necessary elements are added in the mail image.
These files are incompatible with interpolation, so a "moving file" is detected at start and a warning is displayed. interpolation, if set is deactivated. (only for this file, the settings are not modified).