* profile.py, pdb.py: added help() function

* builtin.py: b/w compat for builtin -> __builtin__ name change
* string.py: added atof() and atol() and corresponding exceptions
* test_types.py: added test for list sort with  user comparison function

Lib/pdb.py

@@ -312,3 +312,15 @@ def test():
 	import linecache
 	linecache.checkcache()
 	run(TESTCMD)
+
+# print help
+def help():
+	for dirname in sys.path:
+		fullname = os.path.join(dirname, 'pdb.doc')
+		if os.path.exists(fullname):
+			sts = os.system('${PAGER-more} '+fullname)
+			if sts: print '*** Pager exit status:', sts
+			break
+	else:
+		print 'Sorry, can\'t find the help file "pdb.doc"',
+		print 'along the Python search path'