Add "install" command, "setup" switch to caUtils.

+ Add `caUtils install` which performs an installation to a blank
  database instance.
+ Add `caUtils --setup [/path/to/setup.php]` to allow caUtils to
  use a different setup.php than the one in the root.  This is used
  for integration tests.
+ Fix a bug where logical combination was && where it should be ||,
  in "guess paths" fallback for caUtils.