using of pointers to File instead of copies
picked: cleanups, adding consts where possible
enum type in pandora.hpp for dataTypes.
some Property work, according test
still work to do

Conflicts:

	include/pandora/File.hpp

Conflicts:

	test/src/TestSection.cpp

Conflicts:

	test/src/TestSection.cpp
cherry-pick of commits in cache-rebased except for
b60e99855db902977bf59a86682c98c8aa1d4ad0
8e752f40907b784ffadf83917c13a57009c46cdb
52b6031704375c830108776752b0731be37f66d2