Add linux inotify support to twisted core

[exarkun]

Initial code is checked in at sandbox/inotify.py

[hagbard]

here's the fix to make it work with python < 2.3
Index: inotify.py
===================================================================
--- inotify.py	(revision 13515)
+++ inotify.py	(working copy)
@@ -130,7 +130,7 @@
         request = array.array('c', struct.pack(structWatchRequest,
            pathBuffer.buffer_info()[0], mask))
-        handle = fcntl.ioctl(self.fd, INOTIFY_WATCH, request, 1)
+        handle = fcntl.ioctl(self.fd, INOTIFY_WATCH, request.buffer_info()[0])
         port = iNotifyPort(path, handle, iNotifyFactory, self)
@@ -142,7 +142,7 @@
             return
         del self.ports[handle]
         request = array.array('c', struct.pack(structWatchIgnore, handle))
-        return fcntl.ioctl(self.fd, INOTIFY_IGNORE, request, 1)
+        return fcntl.ioctl(self.fd, INOTIFY_IGNORE, request.buffer_info()[0])
     def connectionLost(self, reason):
         for handle in self.ports.keys():