change constant ruleset value checking

[mdahlhausen]

change existing schedule value check from an exact comparison to within a small tolerance

addresses issue #1119

[mdahlhausen]

@lymereJ this pull requests adds a tolerance value check instead of equality check when adding constant ruleset schedules. It prevents adding duplicate copies identical of constant day schedules like 'Mixed Water At Faucet Temp - 140F Default 17' which are prolific throughout the prototypes. Currently the model regression tests are failing because the duplicate schedules aren't generated. Could you regenerate the regression models?

[lymereJ]

@mdahlhausen - I just uploaded them.

[mdahlhausen]

@lymereJ thanks!