Switch to module-relative import syntax.

Now that the python scripts are all in a "redo" python module, we can
use the "new style" (ahem) package-relative imports.  This appeases
pylint, plus avoids confusion in case more than one package has
similarly-named modules.

redo/state.py

@@ -1,7 +1,7 @@
 import sys, os, errno, stat, fcntl, sqlite3
-import cycles, env
-from helpers import unlink, close_on_exec, join
-from logs import warn, debug2, debug3
+from . import cycles, env
+from .helpers import unlink, close_on_exec, join
+from .logs import warn, debug2, debug3
 
 SCHEMA_VER = 2
 TIMEOUT = 60