Add a maxConditionalRelatedDate function for calculated fields

I need a sibling to the existing rollupConditionalMinDate formula that will find a maximum date where certain related fields meet defined conditions.

Also, it would be good to be consistent with your formula names.  Why isn't rollupConditionalMinDate called minConditionalRelatedDate?  The new formula could then be maxConditionalRelatedDate and you could also create a minRelatedDate while you're about it.