cylc/cylc — pull request #1151 by benfitzpatrick (2014-09-08 16:49:15+00:00)
Title: #1149: require 'P' notation for integer cycling intervals and offsets

This closes #1149 by requiring e.g. `P1` instead of `1` for intervals
and `+P1` for offsets.

@hjoliver, please review.