Added Has functionality at all levels (specific HasSection, in Section c...

I like the slim and light form of your .ini parsing and manipulation library, but in my case a silent check and iteration  functionality was required (my other project uses a .ini file to determine resources to download, this list of resources is extensible, and each resource can have either a .txt file or a .db file; or both). If you would like, merge my modifications with the initial library.