Path for GRIB & Faxes

Minor but useful enhancement to the software. We now have the possibility to give a path - instead of a single directory - for the software to find the GRIB and Faxes. 

It occured to me when I was configuring the new laptop on the ketch, for both Internet and the SSB. The faxes and GRIBs coming from SailMail are not stored on the file system in the same location. 

So now, you can tell the soft to took into morte than one directory when you configure the preferences for GRIBs and Faxes.