Fix call to help-setup-xref and cosmetic changes#956

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whxvd wants to merge 3 commits intoFuco1:masterfrom

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Commits on Jan 13, 2019

[Fix #955] Fix call to help-setup-xref in sp-cheat-sheet
Sebastian Miele
committed
Use -difference instead of --remove and memq in sp-cheat-sheet
Sebastian Miele
committed
Simplify call to help-setup-xref in sp-cheat-sheet
Sebastian Miele
committed