add information about experiment to `inbreeding load` (dragoon/komodo!134)

this can be used by `plot` without passing extra arguments, i.e. the pipeline becomes
```bash
use bins/inbreeding

let experiment = "..."
```
```bash
inbreeding load $experiment | inbreeding plot
```
instead of having to know the value of `k` and do
```bash
inbreeding load $experiment | inbreeding plot --options { k: $k }
```