Mike McQuaid dac66c4ada Add keg_only :versioned_formula.
This is used to indicate a formula is a version of another formula.
This will be used to provide a consistent interface for older formulae
versions and replaces the use of `conflicts_with`.
2017-01-17 10:50:04 +00:00
..
2017-01-17 10:50:04 +00:00
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