#2315 (Dec 2, 2020, 3:41:25 PM)

1. allow partial vectorvar substitutions (commit: f318ccd) (details / githubweb)
2. cleanup varkey imports (commit: b39287f) (details / githubweb)
3. mostly working with vks (commit: 245462a) (details / githubweb)
4. mostly working with vks (commit: e1656f3) (details / githubweb)
5. eh (commit: ba781dd) (details / githubweb)
6. it works (commit: de3b0a2) (details / githubweb)
7. remove gp.v_ss (commit: 513fdb6) (details / githubweb)
8. move varkeys property to constraintset (commit: 4665c99) (details / githubweb)
9. lint (commit: c3074b5) (details / githubweb)
10. add shape check (commit: 17394aa) (details / githubweb)
11. no KeySets hanging around (commit: 619d1e2) (details / githubweb)
12. whoops, snuck in some code from another branch (commit: 861bced) (details / githubweb)
13. cleanup (commit: d7bfabd) (details / githubweb)
14. lint (commit: 5bd1b4e) (details / githubweb)
15. make constraintsaving optional, fix savetxt spacing (commit: 7929c20) (details / githubweb)
16. lint (commit: 8d79d10) (details / githubweb)

GitHub pull request #1532 of commit 5c27eed57291bc6bbd05c1a90edcfb8d6b419b17, no merge conflicts.