3.1 Geographic layers

[ghtmtt]

• add layers (icons for each layer?? e.g. red cross for hospitals....)
• other functions (activate/deactivate, change order, deleting, renaming)

[pcav]

Our idea: add everything to base project, so the user has only to switch the desired layers on and off

[ghtmtt]

ask them for specific symbols (red crosses for hospitals, etc) so that we can add them in the Style Manager