improvements to generalized Schur code #53

Job	Run time
Documentation	2m 16s
pre_job	3s
Julia 1 - macOS-latest - - push	4m 3s
Julia lts - ubuntu-latest - - push	4m 42s
Julia 1 - ubuntu-latest - - push	5m 43s
Julia 1 - windows-latest - - push	7m 3s
Julia lts - windows-latest - - push	5m 31s
Julia nightly - macOS-latest - - push	4m 14s
Julia nightly - windows-latest - - push	6m 39s
Julia lts - macOS-latest - - push	3m 18s
Julia nightly - ubuntu-latest - - push	5m 44s
	49m 16s

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