Reduce diffs between Django ports, standardizing on:
* Prefer CHEESESHOP (Geo CDN) over DjangoProject.com for DISTFILES
* Include version and optionally "LTS" in COMMENT suffixes
* De-scope CONFLICTS to CONFLICTS_INSTALL and update match strings
* Whitespace alignment and improve readability
* Use empty(VARIABLE) instead of ! ${VARIABLE}
* Sort Makefile entries (CPE_VENDOR and CONFLICTS_INSTALL)
Approved by: python (with hat)
bd4c68f35e