The aao record type could use a DOL input link

[Andrew Johnson]

There is currently no way to copy numeric arrays between record fields just using the core database record types. The only way I can think to do it with any standard record type at all would be to use the aCalcout from the synapps/calc module, but that is a rather heavy-weight solution.

This functionality could most easily be provided by adding a DOL input link (and a related OMSL field) to the aao record type. It should be possible to do this in a backwards compatible way and not break existing databases; I would want any solution offered to come with a unit test program which demonstrates that not setting the DOL and OMSL fields leaves the record's behavior exactly the same as it was. I suggest writing the test before adding the new fields.

[Dirk Zimoch (dirk.zimoch)]

Please add new fields at the end of the record structure to keep old device support binary compatible.

[Andrew Johnson (anj)]

PR at https://github.com/epics-base/epics-base/pull/234