gereksiz update yapmıyor, daha düzgün falan filan

  transactions must be left dangling

* clean up the log without calling logging.shutdown(), this should
make it possible to mix pisi logger with other loggers, and make it
properly re-entrant. so much for an easy to use api!

  becomes re-entrant now, and works with build farm, but downside:
  info messages don't show up!

* fix: by default, search functions search also in package names
  in addition to summary and descriptions (thanks gokmen for reminding)

This complements commits 7381, 7384, 7386, 7388 and fixes #2643.

/var/tmp/pisi/hede-x.y/install/xx/binary.debug

with the committed change in 7384.

We will need this to zip /var/tmp/pisi/hede/debug/binary.debug as 
/var/tmp/pisi/hede/install/binary.debug. (debug/binary.debug -> install/binary.debug)