Project organization -- version numbers, directory structure, etc.

[tggagne]

Always interested to learn more about packaging best practices (because I haven't found anyone writing about them), I'm curious

• how you decide when to change version
• when is the package version created, before or after the PR merge?
• what concerns or designs went into the directory structure? It's deeper than I expected
• what other open-source packages are worth looking at for structure, versioning, etc.?