migrate from unittest to pytest structure.

[jGaboardi]

Lots of tests in the esda suite still actively use unittest -- we should migrate all those to the modern pytest structure.

• test_adbscan.py – formats, lints, pytest pt. 2 -- test_adbscan.py  #343
• test_crand.py
• test_gamma.py
• test_geary.py
• test_getisord.py
• test_join_counts.py
• test_lee.py
• test_ljc_bv.py
• test_ljc_mv.py
• test_ljc.py
• test_local_geary_mv.py
• test_local_geary.py
• test_losh.py
• test_map_comparison.py
• test_mixture_smoothing.py
• test_moran.py
• test_shape.py
• test_silhouette.py
• test_smaup.py
• test_smoothing.py
• test_topo.py – formats, lints, pytest pt. 1 -- test_{utils,topo}.py #341
• test_util.py – formats, lints, pytest pt. 1 -- test_{utils,topo}.py #341

[martinfleis]

Note that I've been gradually doing that when adding Graph support as I needed pytest's parametrisation in there.

[jGaboardi]

@martinfleis

Same Q for this issue --> #308 (comment)

[martinfleis]

Same answer :)

[jGaboardi]

This is (of course) turning out to be a far more in-depth task than anticipated (when am I going to learn?). Going to spilt this out by file or groups of files.

xref #340