Improve Logbook

[albar965]

Move logbook entries to own database, search tab and info display.
Merge entries for one flight

[Gulliver54]

I'am very much in favor for this change.
Using logbook adds rapidly large amounts of data clouding other data.

[albar965]

Agree. This is going on my nerves too. I added this to 2.4.

The 2.4 list of changes needs cleanup. A lot of issues in 2.4 will be moved to later versions.
Alex