Consolidate checking into our own unit test class. Remove all files in temp dir after each test, not just spice and gds.

compiler/tests/00_code_format_check_test.py

@@ -1,13 +1,13 @@
 #!/usr/bin/env python2.7
 
 import unittest
-from testutils import header
+from testutils import header,openram_test
 import sys,os,re
 sys.path.append(os.path.join(sys.path[0],".."))
 import globals
 import debug
 
-class code_format_test(unittest.TestCase):
+class code_format_test(openram_test):
     "Run a test to check for tabs instead of spaces in the all source files."
 
     def runTest(self):