Named pipe support leaks file descriptors.

[AlbertoGP]

In FileWatcher.java, the newWatchMap file table might get cleared before a new file added at the FileAdderThread has been processed.

[AlbertoGP]

The named pipe support has therefore been disabled by 2722fc3

I'm working on an improved version.

[AlbertoGP]

The improved pipe support implementation is at #33 "Improved named pipe capability, and spool bug fix".