RFE: Update configuration settings

[s-vincent]

Updates the configuration panel option with recent version of freelan configuration.

A possible long-term approach would be to auto-generate XML configuration part of src/Freelan_gui.ui from freelan.cfg by a script. To achieve that we should have a sort of well-formated configuration file so that the script can extract automatically the following:

• option name;
• description;
• default value;
• type (boolean, filesystem path, basic string, IP address, IPv6 address, list, ...);
  • Type can then be used to generate the right UI (checkbox for boolean, text with file browser button for filesystem path, listbox for options that has strictly delimited authorized values...).