Eliminate if-tests for Types in Builder.execute().
-rw-r--r-- 5010 Construct
-rw-r--r-- 1916 README
drwxr-xr-x - admin
-rw-r--r-- 10693 config
drwxr-xr-x - doc
drwxr-xr-x - etc
-rw-r--r-- 2094 runtest.py
drwxr-xr-x - src
drwxr-xr-x - template
drwxr-xr-x - test