Add multiperiod threshold ops problem (#34) #126

Job	Run time
Julia 1.6 - ubuntu-latest - x64 - push	12m 51s
Julia 1.6 - macOS-latest - x64 - push	10m 12s
Julia 1.6 - windows-latest - x64 - push	20m 7s
Julia 1 - ubuntu-latest - x64 - push	7m 27s
Julia 1 - macOS-latest - x64 - push	7m 51s
Julia 1 - windows-latest - x64 - push	8m 8s
Julia nightly - ubuntu-latest - x64 - push	9m 56s
Julia nightly - macOS-latest - x64 - push	10m 59s
Julia nightly - windows-latest - x64 - push	10m 53s
	1h 38m 24s

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