Moved feret_diameter_max to 2d-only features, was causing memory issues

See merge request !107

Revert "Merge branch 'dev-namespace-pkg' into 'master'"

See merge request !106

This reverts merge request !105

Reorganized with namespace packages

See merge request !105

Moved phenobase references to svlt-pheno; session-persistent phenobase is in its own singleton object

Core tests pass (still iffy on API ones with server), now with core modules in top level svlt.* namespace (no longer need svlt.core.*)

Prototyped namespace package tree: https://packaging.python.org/en/latest/guides/packaging-namespace-packages/

Build config only

See merge request !103

Merge staging as release

See merge request !102

Dev batch runner stats

See merge request !101