[#18847] Material.c Python API calls

Adds access to...
- Anisotropy
- Mirr Threshold
- Trans Threshold

Breaks rule of no additions but python data access is quite safe, vray exporter needed these attributes.

[#18891] BGE Convert script Python 2.5 compatible

release/scripts/textplugin_convert_ge.py

@@ -718,7 +718,7 @@ def convert248to249(lines, log = True, logErrors = True, fileName = None):
 				try:
 					# Convert!
 					func(lines, row, match.start(1), match.end(1), closure)
-				except ConversionError as e:
+				except ConversionError, e:
 					# Insert a comment saying the conversion failed.
 					print "ERROR: %sline %d, %s: %s\n" % (
 						fileIdStr, row + 1, attrName, e)