Message when scipiper version changes

We've hit an issue where some team members have updated scipiper and others have not, and when one team member builds a task table, other team members may see the results as out of date due to a different hash of the task table yml file.

One solution is to give a warning when scipiper version has changed. This could happen right when you load scipiper - we could look in the current working directory for .yml files, see if any of them have a line like
```yml
# using scipiper package version 0.0.16
```
and then give a warning if the package version noted there differs from scipiper's current version.

Alternatively, if our problem is truly just with hashes of the automatically generated task-table yml files, maybe we should leave out that package version info from the task-table ymls.

Start with scipiper loading, the current working directory's .yml files, and generated task-table YAML handling. Resolve whether a version-change warning or hash exclusion is intended; done means one behavior is specified and its effect on out-of-date results is verified.

Written by the indexing model from the issue text.