Noam Raphael's patch.

SF Patch 686254 "Run IDLEfork from any directory without set-up"

Allows IDLE to run when not installed and cwd is not the IDLE directory.

I took the liberty of moving it to the startup scripts since once IDLEfork
is again a part of Python it will be superfluous and I don't want it to
be forgotten.  But it is very useful for those using IDLEfork standalone!

M CREDITS.txt
M NEWS.txt
M idle
M idle.py
M idle.pyw

Lib/idlelib/idle.pyw

@@ -1,10 +1,18 @@
-#!/usr/bin/python
-
 try:
     import idlelib.PyShell
 except ImportError:
     # IDLE is not installed, but maybe PyShell is on sys.path:
-    import PyShell
-    PyShell.main()
+    try:
+        import PyShell
+    except ImportError:
+        print "Can't locate PyShell.py"
+    else:
+        import os
+        idledir = os.path.dirname(os.path.abspath(PyShell.__file__))
+        if idledir != os.getcwd():
+            # We're not in the IDLE directory, help the subprocess find run.py
+            pypath = os.environ.get('PYTHONPATH', '')
+            os.environ['PYTHONPATH'] = pypath + ':' + idledir
+        PyShell.main()
 else:
     idlelib.PyShell.main()