Support for writing VDoubleArray over ca

[georgweiss]

Currently a write using VDoubleArray over ca completes without errors, but does not actually write the values.
A write should support VDoubleArray (and other numeric array types) in addition to accepting primitive arrays.

[shroffk]

So as agreed,
A write of a VNumberArray will use the [] values to write to the pv and ignore the timestamp, alarm, display and other fields which cannot be writted.