Add user definable functions aggregates and collations#155

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coddingtonbear wants to merge 2 commits intoharelba:masterfrom

coddingtonbear:add_user_definable_functions_aggregates_and_collations

Commits on Oct 17, 2017

Adding functionality allowing third-party packages to define functions, aggregates, and collations.
coddingtonbear
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Make it possible for errors when loading entrypoints to be surfaced.
coddingtonbear
committed