[NPFS]

[NPFS]
- Rename DEVICE_EXTENSION to NPFS_VCB.
- Add a type variable to distinguish FCBs and CCBs for device, directory or pipe.
- Attach an FCB to the VCB that represents the root directory of the file system and implement an open routine for the root directory.
- Make NpfsWaitPipe work when it is called for the root directory.

[KERNEL32]
- Remove the old version of WaitNamedPipeW.

This patch fixes the broken wait pipe code. It was written and tested on r49458 because later revisions do not work for me.

svn path=/trunk/; revision=49646