[FEATURE] added +, += for tables
[FEATURE] global setting if times are in seconds or minutes
[RELEASE] v 2.4.0
[FIX] fixed regression in r bridge from 13e4e7a
[RELEASE] v 2.4.1
[FEATURE,FIX] time unit is now meta value, replaces 230e52dc07
[TESTS] added scripts for interactive gui testing
[RELEASE] v 2.4.2
Merge branch 'master' of github.com:uweschmitt/emzed2