[BUG] Clear up or ignore unused .jar files when upgrading modelator.

[danwt]

Description

The user upgrades the version of modelator but does not delete old .jars or the old .modelator directory. This causes the newer modelator to find the old jars (which be the wrong versions) and fail.

Expected behavior

Modelator should detect old jars and replace them with the correct ones.

[danwt]

I suggest we allocate this feature to mbt-python, as mbt-python will in the future take care of all jars/downloads.

[rnbguy]

I agree @danwt. but we have to fix the bug for usability. I will open a PR to fix this in Rust for next patch release.

[danwt]

I agree @danwt. but we have to fix the bug for usability. I will open a PR to fix this in Rust for next patch release.

Yep, good idea