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Also fix bug/limitation in mpi_copy: would segfault if src just initialised
and not set to a value yet. (This case occurs when copying a context which
contains only the public part of the key, eg.)

- trust chain of depth 0
- invalid signature
- trust chain of depth 2
- multiple trusted CA's

md_free_ctx()

(Made possible by the OID fix.)

- point_format is of no use
- d was init'ed and free'd twice