[evlatests] new executor software (v1.2.0)

[Barry Clark]

> 1. Changes in several modules to better support subarrays.
> 2. Commands to deformatter issued in deferred mode to avoid messing
> up last ten seconds of scan before switching to 4, P, or U bands.
> 3. Intentions restricted to key=value format, with duplicate keys superceded
> 4. Some support for phased array VLBI
> 5. Bugs fixed in planetary calculations
> 6. Delay polynomials generated for WIDAR

And u,v values fixed.