gpg: New option --import-filter
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Description

gpg: New option --import-filter

* g10/gpg.c (oImportFilter): New.
(opts): Add --import-filter.
(main): Handle option.
* g10/import.c: Include recsel.h, init.h, and mbox-util.h.
(import_keep_uid): New global var.
(cleanup_import_globals): New.
(parse_and_set_import_filter): New.
(filter_getval): New.
(apply_keep_uid_filter): New.
(import_one): Apply filter if set.

Funny new option. It can for example be used to export a key with
only one user id:

gpg --no-options --import --import-options import-export \
    --import-filter keep-uid='mbox=wk@gnupg.org'         \
   < full-key.pub > key-with-one-uid.pub

More features will eventually be added.