- Removed use of FormulaVersions - it's generally too brittle for our uses. We
now interface directly with the Git repo via utils/git and monkeypatch the
formula loading process where needed.
- Really old formulae (that specify fields as instance vars instead of methods)
still need more work to be supported; they don't work here quite yet.
- Properly handles deleted/removed formulae from Homebrew/homebrew-core.
Additional work is still needed to search through Homebrew/legacy-homebrew if
this functionality is desired.