Add ComputeIdealPoint attribute #261

Job	Run time
Julia 1.6 - ubuntu-latest - x64 - pull_request	10m 17s
Julia 1 - ubuntu-latest - x64 - pull_request	12m 13s
Julia 1 - windows-latest - x64 - pull_request	13m 43s
Julia 1.6 - ubuntu-latest - x86 - pull_request	12m 27s
	48m 40s

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