Version 1.6.6

Add Python 3.13 to unit tests

Add support for AUTOUGH2 EOS EWCX and EWAX in t2data json()

Update docs for EOS3 support in t2data json()

Add unit test for EOS4 / MOP(19) = 2

Use unit test results from TOUGH2 output

Add support for EOS4 with MOP(19) = 2 in t2data eos_json()

Use same ww constant as in TOUGH2

Add support for EOS3 models in t2data json()

Introduce convert_primary*() in t2data for JSON conversion

Version 1.6.5

In column_track() base tolerance on local rather than global grid size

Version 1.6.4

Define derivative() instead of using now-deprecated scipy function

Update Python versions in unit test Github action