Add name to material properties dict

[Vermee81]

Closes #92

I am not sure the repository is still active.
If it has no trouble for you, please merge this PR.

=========================================== test session starts ============================================
platform darwin -- Python 3.11.2, pytest-7.4.2, pluggy-1.3.0
rootdir: /Users/vermee81/src/github.com/Vermee81/pysand
collected 100 items

tests/test_asd.py ...................... [ 22%]
tests/test_choke.py .............. [ 36%]
tests/test_erosion.py ................................................... [ 87%]
tests/test_fluidproperties.py ...... [ 93%]
tests/test_probe.py .. [ 95%]
tests/test_transport.py ..... [100%]

=========================================== 100 passed in 5.23s ============================================

[smolvik1]

LGTM