Tighten up $mask on ncck_system_list?

First off. Let me say that this is an AMAZING module. Powerful, yet super easy to use. Great work.

I did notice one weird thing, however, as I was setting it up. I kept getting extra, un-labeled checkboxes in the various provider fieldsets (see attached screenshot). I assumed it was a bug. But I tracked it down to the fact that all in the files in my /providers directories were checked out by Dreamweaver -- and, thus, there were extra .LCK files in the directories (e.g., - bliptv.inc.LCK). The module was thus reading these files as (essentially empty) provider .inc files. Hence the empty checkboxes.

I know this is an incredibly minor detail and it doesn't seem to have any major front-facing adverse effects (though, for whatever reason, my username and email were also being dumped to the screen when these files were checked out!?!). But anyone in a similar boat could definitely get confused, think the module is broken, etc.

Seems like it can be fixed fairly easily by tightening up the regex $mask in ncck_system_list a tiny bit. (I changed it to "$provider\.inc$" and my problems were solved.)

Anyway, I just thought I'd throw that out. Thanks again for such a great module.