#16 slow importing of full keyrings

[Francisco Jesus Monserrat Coll]

The import from scratch of a full keyring dump in the
database is very slow.

In the same machine (2xPIII-800, 1Gb RAM, SCSI RAID 5)
the import of a full dump (split of 2Mb PGP keys) last
3 days . The import of the database in a pksd server
last less than 1 day.

The problems seems to be related to the indexes
perhaps cks_import should drop the index on the
database before importing the rings and
later create again the index when the upgrade is completed.

[V. Alex Brennen]

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This is a complex issue. I plan to support *dbm style
databases which will dramitally improve the import speed.
However, the real issue is that CKS does more parsing I
believe than pksd when parsing packets, so more CPU time is
used. I'm not sure I want to remove this code as it helps
keep invalid or damaged keys from being imported.

A rewrite of the code to use a buffered stream fromat import
may help, but I am going to put such work aside until the
server becomes stable and reaches v1.0.0. I may be able to
use mmap to speed thing up with the current code.