chg: usr: prep for 3.2 release, update readme and changelog docs

Merge pull request #37 from sarnold/fix-rollup

chg: dev: cleanup deb package workflow, make one artifact

chg: dev: fix debian rules file, update tox default CC var

chg: doc: use gitchangelog, replace old tool cfg, update tox file

chg: dev: workflow and makefile cleanup, add simple tox file

Fix from Erwan Legrand on the implicit integer cast

bump last workflow (conda) to windows-2019 (2016 is now deprecated)

Merge pull request #36 from sarnold/fix-ci

update workflows, fix missing cmd, check windows env

update readme_install doc, tweak apt pkg installs (ci workaround)

Merge pull request #25 from sarnold/readme

cleanup both markdown docs

fix some markdow format (need a local linter)

test upstream codeclimate badge