Combine several jobs into one to save computation resources

[dachengx]

Develop a new ticket generator: combined_tickets_generator which combines combine_n_job jobs into one by " && ".

Because the initialization of the container and environment will take some time, which is a constant offset proportional to the number of jobs. So this PR will reduce those time.

[github-actions]

Pull Request Test Coverage Report for Build 7511654057

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.2%) to 90.599%

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Totals
Change from base Build 7511624308:	-0.2%
Covered Lines:	1407
Relevant Lines:	1553

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💛 - Coveralls

[github-actions]

Pull Request Test Coverage Report for Build 7511725544

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.3%) to 90.599%

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Totals
Change from base Build 7511724235:	-0.3%
Covered Lines:	1407
Relevant Lines:	1553

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💛 - Coveralls

[github-actions]

Pull Request Test Coverage Report for Build 7583552712

• 10 of 15 (66.67%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.2%) to 90.677%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
alea/submitter.py	10	15	66.67%

Totals
Change from base Build 7556510982:	-0.2%
Covered Lines:	1420
Relevant Lines:	1566

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💛 - Coveralls

[hammannr]

@dachengx I quickly went over the code -- just for my understanding: Isn't this the same as just reducing the n_batch parameter?

[dachengx]

@hammannr I see your concern. Sorry, I was not clear enough in the description. Each job will have a unique nominal_value or generate_value for a parameter. Sometimes the number of combinations of different nominal_values and generate_values is very large. If I want to do a gridscan of two parameters' nominal_values, and each has 100 different choices, I will need to submit 10000 jobs. This PR mainly solves such a problem. If I set combine_n_jobs to 100, then I will only need to submit 100 jobs.

[hammannr]

Looks good! Two minor comments then you can go ahead and merge I'd say 😊

[hammannr]

Suggested change

	"""Get the combined submission script for the current configuration. ``self.vcombine_n_job``
	"""Get the combined submission script for the current configuration. ``self.combine_n_job``

[hammannr]

could you maybe add a small example to make clear how/why one should use the combine_n_jobs? 😊