Merge pull request #426 from TsudaKageyu/string-cmp

Added some operators to compare String to string literals.
smartptrs for master
smartptrs for master

Conflicts:
	taglib/toolkit/tstring.cpp
smartptrs for master
smartptrs for master
smartptrs for master
smartptrs for master

Conflicts:
	taglib/toolkit/tstring.cpp
	taglib/toolkit/tstring.h
smartptrs for master
smartptrs for master
smartptrs for master