Merge branch 'hotfix/0.25.20.15'
Fix a logging string variable missing.
AUTHORS.md update with more details and better descriptions (cæsar should be happier).
Remove graphical-template text, it's a non-issue now that Erick donated the right to use the template under AGPLv3. Small enhancements and cleanups.
version bump for 0.26
Merge branch 'release/0.26'
Merge tag '1flow-0.26' into develop

0.26