Print Argument combinations to be submitted

[hammannr]

This is just a very small change for submission in debug mode.
It will print all parameter combinations that would be submitted, which can be helpful when using many to_zip and to_varyarguments.

[coveralls]

Pull Request Test Coverage Report for Build 8706535115

Details

• 4 of 4 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 91.979%

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Totals
Change from base Build 8706533540:	0.02%
Covered Lines:	1548
Relevant Lines:	1683

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💛 - Coveralls

[dachengx]

Thanks @hammannr . LGTM