fix: bug preventing proper starting and stopping of linien-server

release 0.5.2

Bump version to 0.5.1.

Release 0.5.0-1.

release 0.4.3

temporarily disable "check lock" and "watch lock" due to problems wit…

…h new autolock algorithms. To be re-deveoped soon

release 0.4.1

release 0.4.0

add CHANGELOG, release 0.3.2

fix derivative (closes linien-org#134)