Update of configuration header files

* Moved Builder-extensions informations
  from Builder configuration header file 
  to global configuration header file
* Cleaned CMake variables

(closes OpenFLUID/openfluid#478)
Fix of signature of GDAL observer

* Moved description text from name declaration
  to description declaration
Enhancement of simulation dialog

* Added pause and stop buttons
* Added counter of simulation warnings
* Added clearer informations about simulation status and stage
* Cleaned code

(closes OpenFLUID/openfluid#474)
Update of icons, strings and translations of the simulation dialog
Cleaning of compilation warnings

(closes OpenFLUID/openfluid#33)
Explicit derivation from template class, in order to be compatible with
CentOS compiler requirements

(closes OpenFLUID/openfluid#393)
Update of CHANGELOG, and version status switched to rc1