Modification of fluidx file format for spatial attributes

* Updated fluidx files tags 
* Cleaned code

(references OpenFLUID/openfluid#216)
Rename of inputdata into attributes for wares base classes and
signatures

* Renamed primitives
* Renamed signature declaration macros
* Updated tests and tests datasets

(references OpenFLUID/openfluid#216)
Rename of inputdata into attributes in API

* Updated names in API source code
* Updated names in applications source code according to the 
  new names used in API
* Updated tests and tests datasets

(references OpenFLUID/openfluid#216)
Rename of inputdata into attributes in applications (GUI, CLI)

* Updated names in applications source code
* Updated tests and tests datasets
* Cleaned code

(references OpenFLUID/openfluid#216)
Modification of opening message in CLI application

* Replaced "LISAH, Montpellier, France" by the OpenFLUID web site URL