[cdt-dev] checked in some EFS fixes for CDT

[Chris Recoskie <recoskie@xxxxxxxxxx>]

I checked in some changes to get EFS projects working and to allow EFS
resources to work better in the editor.  You can now create managed or
makefile projects successfully on a non-local EFS filesystem and open the
files.

- fixed a bunch of NPEs in the build system when IProject.getLocation()
returned null
- created a new IStorage implementation (EFSFileStorage) that can be backed
with an EFS file.
- added some utility methods that deal with URIs

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Chris Recoskie
Team Lead, IBM CDT Team
IBM Toronto
http://www.eclipse.org/cdt