Kultools

What's Changed
* removed unused imports by R1j1t in https://github.com/kul-group/kultools/pull/19
* added functionalty to specify the signal to handle by R1j1t in https://github.com/kul-group/kultools/pull/20


**Full Changelog**: https://github.com/kul-group/kultools/compare/v0.2...v0.4

Added checkpoint code, which creates a `STOPCAR` near the wall time limit and exits elegantly.

What's Changed
* Added checkpointing code by R1j1t in https://github.com/kul-group/kultools/pull/17
* prepared for release by R1j1t in https://github.com/kul-group/kultools/pull/18


**Full Changelog**: https://github.com/kul-group/kultools/compare/v0.1...v0.2

New Contributors
* DexterAntonio made their first contribution in https://github.com/kul-group/kultools/pull/1
* JiaweiGuo-0313 made their first contribution in https://github.com/kul-group/kultools/pull/2
* R1j1t made their first contribution in https://github.com/kul-group/kultools/pull/8

**Full Changelog**: https://github.com/kul-group/kultools/commits/v0.1