gui: small slider tweaks and cleanup
Merge branch 'master' of delmic-server.local:odemis
gui: regenerated updated and fixed test user interface
gui: regenerated updated and fixed test user interface
gui: regenerated updated and fixed test user interface
gui: fix test cases in foldpanelbar

still some problems with size and horizontal bar detection.
Test cases fail but it doesn't seem to affect actual user experience, so the test cases
can be fixed later...
gui: update slider_test to use generic function
gui: update acqmng test cases

update to latest API.
Use new way to start the backend

All test cases pass again.
gui: update dblmscopecanvas_test

still 2 test cases failing due to changes in dblmscopecanvas