fix some memory leaks
[pyqgis-console] fix indentation
[pyqgis-console] shows also derived class name in object browser widget
[pyqgis-console] allows to handle non-ascii chars in script file name
Disable encoding combobox in layer properties dialog for OGR provider with OLCStringsAsUTF8==true (so when it doesn't work anyway). Patch from Minoru Akagi.
Merge pull request #548 from minorua/raster_memory_leaks

Fix some memory leaks Fix #6795