Final tweaks
Final tweaks

* added  a cross-ref to optional parameters in the initial section
* Improve A1 to mention the possibility to use RESORBs
* New section describing how to use the product
* New item in the FAQ about how to use the product
Terradue/doc-tep-geohazards,Terradue/doc-tep-geohazards,Terradue/doc-tep-geohazards