Mepo

Fixed

- Updates to allow mepo clones to be moved (106)
- A bit of nicety on `mepo status` for detatched HEAD states
- Adds `mepo-cd.zsh` as I couldn't figure out how to get the bash script to work in zsh

Fixed

- Bug fixes for `mepo save`
- The command would save the new yaml file in `pwd` rather than at the "root" directory where the original was. This was a bit confusing, so the command now saves at root level
- `mepo save` did not handle hashes well. There is no reason it couldn't save to a hash, but it labeled it as a `branch` in the yaml file which, while not broken, was in consistent.

Added

- Add `dry-run` for `checkout-if-exists`

Added

- Add per-repo diff

Added

- Added `mepo tag` commands
- Added `.zenodo.json` file

Changed

- Update `mepo branch list` to work on one or more repos

Added

- Add `restore-state` command
- Note: at present this will restore *EVERYTHING* to the previous state. Not a repo here or there.