Merge pull request openmc-dev#1848 from paulromano/hotfix-release-0.12.2

Hotfix release 0.12.2

Merge pull request openmc-dev#1803 from paulromano/fix-releasenotes

Fix release notes for 0.12.1

Merge pull request openmc-dev#1614 from paulromano/release-0.12

Final change for version 0.12.0

Merge pull request openmc-dev#1373 from paulromano/release-0.11

Final changes for version 0.11

Merge pull request openmc-dev#950 from paulromano/release-0.10

Final updates for next release

A few small fixes in example notebooks

Fix bug in OpenCG compatibility module

Add Bryan Herman to release notes

Fix hyperlink in documentation

Incremented version number to 0.6.2 and added release notes