Support non-interpolating quantile definitions #283

Job	Run time
Documentation	1m 29s
Julia min - ubuntu-latest - pull_request	1m 36s
Julia min - macOS-latest - pull_request	1m 17s
Julia min - windows-latest - pull_request	2m 43s
Julia 1 - ubuntu-latest - pull_request	2m 27s
Julia 1 - macOS-latest - pull_request	2m 4s
Julia 1 - windows-latest - pull_request	3m 18s
Julia lts - ubuntu-latest - pull_request	1m 52s
Julia lts - macOS-latest - pull_request	1m 26s
Julia lts - windows-latest - pull_request	2m 33s
Julia pre - ubuntu-latest - pull_request	2m 30s
Julia pre - macOS-latest - pull_request	1m 35s
Julia pre - windows-latest - pull_request	3m 7s
	27m 57s

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