Return an error for some export key operations.
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Description

Return an error for some export key operations.

* src/context.h (OPDATA_EXPORT): New.
* src/export.c (op_data_t): New.
(release_op_data): New.
(parse_error): New.
(export_status_handler): New.
(export_start, export_ext_start): Prepare op_data.
(gpgme_op_export_ext, gpgme_op_export_keys): Return an error from the
status handler.

To support an error return also for the async functions we need to
extend the API. Until we have done that this new features helps at
least in some cases; in particular for --send-keys.