list of user-visible changes between releases of osec:

[1.0.0]
* switch from Berkley DB (db4) to Constant Database:
   - faster
   - minor database size
* reporter is a separate program (osec_reporter filter) now
* no libing and libxml
* osec now can work in read-only mode. So you can place osec and it's database to read-only
storage, e.g. CD-ROM.

[0.6.0]
* global database locking during work
* rewrite Reporter object
* use session key to avoid races with system time
* more safe deletion of keys from database
* more safe internal encode/decode scheme
