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Currently, a RevertableProperty's Properties always both HasInfo. This
means that if a Property NoInfo is updated to be a RevertableProperty, and
someplace called ensureProperty on it, that will refuse to compile.
The workaround is generally to export the original NoInfo property under
a different name, so it can still be used with ensureProperty.
This could be fixed:
data RevertableProperty i1 i2 where
RProp :: Property i1 -> Property i2 -> RevertableProperty i1 i2
However, needing to write "RevertableProperty HasInfo NoInfo" is quite
a mouthful!
Since only 2 places in the propellor source code currently need to deal
with this, it doesn't currently seem worth making the change, unless a less
intrusive way can be found.
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