lower jina rate floor

[Debraheem]

See: https://github.com/MESAHub/mesa/issues/645

We currently have the default reaclib_min_T9 = 1d-2 (i.e. no reactions below 10 MK) as a MESA default, I would like to bring this down so we are not missing key reactions like li7 and be9 burning.

I have tested with reaclib_min_T9 = 1d-4 (i.e. no reactions below 1d5 K) with no issues, see https://testhub.mesastar.org/EbF%2Flower_jina_rate_floor/commits/8555db8. The testing looks good. I would appreciate any feedback or further testing from any members of the community on this.

I will modify the changelog once we come to a conclusion on this.