Add support for Charm 7.0.1, switch container to it, and add Charm++ license+copyright

[nilsdeppe]

Proposed changes

• This maintains support for 7.0.0 since 7.0.1 is only a license change with no code changes. There's no reason to update the version on any clusters, etc. since the license is only relevant for distributing compiled executables and libraries. @kidder is working on Charm 8.0.0 support, which also has the new license, and we can delay updating Charm++ everywhere until that's released.
• I have not yet pushed the container but tested it on my fork.

Upgrade instructions

Code review checklist

• [ ] The code is documented and the documentation renders correctly. Run make doc to generate the documentation locally into BUILD_DIR/docs/html. Then open index.html.
• [ ] The code follows the stylistic and code quality guidelines listed in the code review guide.
• [ ] The PR lists upgrade instructions and is labeled bugfix or new feature if appropriate.

Further comments

[nilsvu]

@wthrowe did you want to look at this too? Edit: on vacation

[nilsdeppe]

I believe @wthrowe is on vacation until Thursday and we would like this merged for the ETK workshop, which is this week. Kyle's presenting on Thursday. Given the time pressure, I'd like to retroactively address any comments @wthrowe may have.

[knelli2]

Yes thank you for the speedy reviews :)

[nilsdeppe]

I'll submit a separate PR with the Ubuntu 18.04 support. I have that mostly working now for automated deployment...