Replace bitbucket urls with git.doit.wisc.edu equivalents

Also moved README-release to RELEASE.md so gitlabs will present README.md at the project page.

Adding @bjsousa and @ahoffmann as additional reviewers.

looks good!

edit; looks like the +1 emoji doesn't trigger the +1 anymore? I added that manually with the new smiley icon.

Doesn't seem so.

Status changed to merged

mentioned in commit 4680dca9