[PATCH] Remove unnecessary dir()/set() calls in Template.__init__()

When running cheetah.Tests.Performance.DynamicMethodCompilationTest
with 100000 iterations set, Template.__init__() is the most performance
sensitive call.

Prior to this commit:
    ncalls  tottime  percall  cumtime  percall filename:lineno(function)
    100000   12.558    0.000   15.274    0.000 Template.py:1025(__init__)

After this commit:
    ncalls  tottime  percall  cumtime  percall filename:lineno(function)
    100000    1.263    0.000    3.541    0.000 Template.py:1025(__init__)

That code need not execute every time __init__ is called
---
 cheetah/Template.py |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/cheetah/Template.py b/cheetah/Template.py
index 01cf676..c903460 100644
--- a/cheetah/Template.py
+++ b/cheetah/Template.py
@@ -1213,11 +1213,10 @@ class Template(Servlet):
         ##################################################           
         ## Setup instance state attributes used during the life of template
         ## post-compile
-        reserved_searchlist = dir(self)
         if searchList:
             for namespace in searchList:
                 if isinstance(namespace, dict):
-                    intersection = set(reserved_searchlist) & set(namespace.keys())
+                    intersection = Reserved_SearchList & set(namespace.keys())
                     warn = False
                     if intersection:
                         warn = True
@@ -1832,7 +1831,7 @@ class Template(Servlet):
         return dic
 
 T = Template   # Short and sweet for debugging at the >>> prompt.
-
+Reserved_SearchList = set(dir(Template))
 
 def genParserErrorFromPythonException(source, file, generatedPyCode, exception):
 
-- 
1.6.5

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