added hindi language to GUI on request
[processing] code formatting, make sources more pep8 compliant
[processing] use QtDesigner ui file for Edit rendering styles dialog
Requirements SIP >= 4.12, PyQt >= 4.8.3
 SIP >= 4.12 for keyword_arguments Module argument
 PyQt >= 4.8.3 for QSettings with type argument
[processing] use QtDesigner .ui for Multiple selection dialog
[processing] use QtDesigner .ui for Autofill dialog