Feature: Update existing ini files

[GaryLBaird]

I've been looking at the inifile.vbs and it does not appear to update an existing INI file. It works great when creating new ones though and I really like the code structure. I wrote an INI reader/writer/creator script in 2006 when I was first starting to mess around with vb. Yours is much better and has a lot of potential. I propose supports a single file read when updating multiple key/values under the same section. I wonder if you can help me to improve it so that it can handle updating existing ini files and get rid of mine all together.
I branched a copy on my github repo so I can check in changes as I make them. I haven't changed anything yet, but me know if you have suggestions or want to work collectively.