Merge libdo.py and log.py into helpers.py.

log.py

@@ -1,23 +0,0 @@
-import sys, os
-import vars
-
-
-def _log(s):
-    sys.stdout.flush()
-    sys.stderr.write(s)
-    sys.stderr.flush()
-
-
-def _clog(s):
-    _log('\x1b[32mredo: %s\x1b[1m%s\x1b[m' % (vars.DEPTH, s))
-def _bwlog(s):
-    _log('redo: %s%s' % (vars.DEPTH, s))
-if os.isatty(2):
-    log = _clog
-else:
-    log = _bwlog
-
-
-def debug(s):
-    if vars.DEBUG:
-        _log('redo: %s%s' % (vars.DEPTH, s))