* In PVScalarArray
Add methods assign, getAs/putFrom, and copyOut/copyIn to allow get/put
with implicit convert.
assign() copys on PVScalarArray to another converting as necessary.
If the types do not match then an allocate and convert is done.
getAs/putFrom work with shared_vector<T> and can avoid a allocate
and convert operation if the types match.
copyOut/copyIn use plain C arrays will do either a copy if the types
match, and a convert otherwise. No allocation is performed.
* In PVValueArray<T>
All array operations re-implemented in terms of
two virtual methods
virtual const shared_vector<T>& viewUnsafe() const;
virtual void swap(shared_vector<T>&);
Some convienence methods are also included:
shared_vector<const T> view() const
shared_vector<T> take()
shared_vector<T> reuse()
Deprecate get(...), put(...), and shareData(...)
Remove getVector() and getSharedVector()
Adjust DefaultPVArray accordingly
e843779555