import_key: enrich return value, adding the list of imported FPRs #14

Before this change there was no way of knowing the FPR of a key being imported from a file, for example this way:

import pEp
pEp.import_key(open('/home/luca/pep-src/engine-user/keys/bob-pub.asc').read())

The result of pEp.import_key was a list of affected identities.

This change enriches the result, now a tuple containing:

the list of affected identities, as before;
the list of imported FPRs, as a list of strings.

This is in theory an incompatible change but I do not see the result of import_key being ever used. The new result will be quite useful to me, and probably to @nkls as well.

Before this change there was no way of knowing the FPR of a key being imported from a file, for example this way: import pEp pEp.import_key(open('/home/luca/pep-src/engine-user/keys/bob-pub.asc').read()) The result of `pEp.import_key` was a list of affected identities. This change enriches the result, now a tuple containing: * the list of affected identities, as before; * the _list of imported FPRs_, as a list of strings. This is in theory an incompatible change but I do not see the result of `import_key` being ever used. The new result will be quite useful to me, and probably to @nkls as well.

And, @heck, I hope it is okay for me to create branches in the positron/ namespace. I can delete them after they are merged.

And, @heck, I hope it is okay for me to create branches in the `positron/` namespace. I can delete them after they are merged.

Thanks!

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import_key: enrich return value, adding the list of imported FPRs #14