Merge branch 'hotfix-more_spec_fun'
Remove custom tag and correct source tag

- Remove custom tag as they're not a thing in rpm spec files (as useful as
  they would be).
- Correct source tag so that the filename matches the tag in git.
Update changelog for 1.2.0-4
Merge branch 'hotfix-source-to-git'
Merge branch 'hotfix-source-to-git' into dev
Add release number to spec setup macro
Update changelog and bump release number
Merge branch 'hotfix-more_spec_fixes' into dev