Refresh Open in Finder buttons - #pragma mark - organize methods

@futureimperfect here's the code for enabling / disabling the "Open in Finder" buttons when switching to the Local Folders tab.  I also put a call to enable / disable on controlTextDidEndEditing for the related text fields.

Also did a little bit of house cleaning and grouped related methods together.  You may want to go over the #pragma mark declarations and evaluate their semantic appropriateness...

If you find this to your liking, it should be pulled into the LGInstaller class prior to taking that one into the 1.0.4-rc branch.

--Thanks
Eldon