fixed: hide helper functions in cpp

makes header looks clean
added: IniConfigFlatter

this tool converts ini-like configurations into simple plain ini-format
(without comment or group)
added: non-10 base support in integer conversion
Merge branch 'master' of github

Conflicts:
	IniConfig/iniconfig.cpp
	IniConfig/iniconfig.h
modified: make read() and write() public
tweak: some method was put into cpp to keep header clean