When updating, change these files (if needed):

- VERSION [0]
- ChangeLog [1]
- AUTHORS
- CREDITS
- src/text.c (years in Copyright lines near EOF)
- run: make -C po update-po


When done:

- run: make relcheck
- run: make distcheck
- test Debian packaging
- make a pull-request


[0] $ scripts/mknextver
[1] $ scripts/mkchangelog
