Rename 'TimeStamp' ext. module -> '_timestamp'.

Avoids clash w/ pure-Python 'timestamp' module on case-insensitive filesystems.

N.B:  the canonical way to import the ``TimeStamp`` class is now::

  from persistent.timestamp import TimeStamp

which will yield the class from the extension module (if available),
falling back to the pure-Python reference implementation.

CHANGES.txt

@@ -4,7 +4,15 @@
 4.0.1 (unreleased)
 ------------------
 
-- TBD
+- Renamed ``TimeStamp`` extension module to avoid clash with pure-Python
+  ``timestamp`` module on case-insensitive filesystems.
+
+  N.B:  the canonical way to import the ``TimeStamp`` class is now::
+
+    from persistent.timestamp import TimeStamp
+
+  which will yield the class from the extension module (if available),
+  falling back to the pure-Python reference implementation.
 
 
 4.0.0 (2012-08-11)

persistent/cPersistence.c

@@ -1417,7 +1417,7 @@ initcPersistence(void)
 
   if (!TimeStamp)
     {
-      m = PyImport_ImportModule("persistent.TimeStamp");
+      m = PyImport_ImportModule("persistent.timestamp");
       if (!m)
         return;
       TimeStamp = PyObject_GetAttrString(m, "TimeStamp");

persistent/timestamp.py

@@ -132,6 +132,6 @@ class pyTimeStamp(object):
         return self.__class__(later)
 
 try:
-    from persistent.TimeStamp import TimeStamp
+    from persistent._timestamp import TimeStamp
 except ImportError: #pragma NO COVER
     TimeStamp = pyTimeStamp

setup.py

@@ -56,8 +56,8 @@ else:
                                         'persistent/ring.c',
                                        ]
                             ),
-                   Extension(name = 'persistent.TimeStamp',
-                             sources= ['persistent/TimeStamp.c',
+                   Extension(name = 'persistent._timestamp',
+                             sources= ['persistent/_timestamp.c',
                                       ],
                             ),
                   ]