Patch: pluralize removeFile/removeFolder API

[Olivier JG]

  On 10/13/2010 11:38 PM, Aleix Pol wrote:
> API wise:
> - You can't call it removeFilesAndFolders and pass ProjectBaseItem's 
> because there might be targets there too (target removal doesn't work 
> with cmake yet, though, but we could add that easy). Maybe removeItems()?
That was my idea originally, but then I noticed that removeTarget is in 
IBuildSystemManager. IOW, from the API point of view, as it stands, 
removing files/folders and targets are two different things. I asked 
Milian and he said to keep it that way and go with removeFIlesAndFolders.
As far as what to do, currently the ProjectManagers get a nice clean 
list of only folders and files passed to removeFilesAndFolders, and as 
long as it stays that way, it's not an issue. Perhaps I should ASSERT 
that stance though?

Thanks for reviewing
-Olivier JG