* Possibility to browse SVIR projects on the OpenQuake Platform and download a
full project (including layer's data and project definition metadata)
* Possibility to manually editing a project definition
* Fix corner-case issue about saving a layer imported from the OpenQuakee
Platform into a QGIS project
* Fix upload time (now including both date and time, instead of just the date)
* Minor fixes improving usability and error management
Warning: QGIS SVIR projects saved with previous versions, might contain an
incompatible project definition format.