rename src to pylib and in data.seq float rounding uses start as well

tests/test_time_of_day.py

@@ -14,7 +14,7 @@ from time import mktime
 
 import os
 import sys
-sys.path.insert(0, os.path.abspath('../src'))
+sys.path.insert(0, os.path.abspath('../pylib'))
 from time_of_day import (in_seconds, seconds, seconds_norm,
   minutes, minutes_norm, hours, hours_norm, days, days_norm,
   transform)