Update to SIP api from 1.8 to 2.0
Modifications of some code lines due to substitution of QStringList to python List => some QStringList method has
been remapped in native Pyhon code.
These modification follows the porting guideline in:
http://hub.qgis.org/wiki/quantum-gis/Python_plugin_API_changes_from_18_to_20
!!! All modification applid BUT that related to SIGNAL handling that will be applied in other commit !!!
iupdate plugin metadata to work with QGIS 2.0 as minimal version
compiled py related to code modification to move SIP api from 1.8 to 2.0 (BUT signal handling)