final release 0.6.20. 

new release 0.6.19 

New release 0.6.18 

Create new release 0.6.17 

final release. 

update export script. 

create new release openct 0.6.14. 

new openct release 0.6.13 

release openct 0.6.12 

set version to 0.6.11.