PI-3473 Rename "engine.provides" (#3590) #3622
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During work on #3556, it became clear to me that the use of
engine.provideswithin the pyke rules, and in a few places withiniris.fileformats.netcdfis confusing : Because this term collides with the special reserved meaning of "provides" within Pyke rules, as seen in the repeated usage offacts_cf.provides(..)in most of our Pyke rules.In fact, although
engineis a Pyke object,engine.providesis just a monkey-patched additional property attached by our netcdf code, to keep track of cube component objects created during rules evaluation (coordinates, cell-measures and ancillaries).So, this PR just renames it to something less confusing.
This should produce no functional change.
Note - See #3590 for comments. This PR is identical to it, but re-checks the tests as one of the travis tests had stalled for an unknown reason and couldn't be restarted.