Abstract pulse template.

[shumpohl]

A draft for an abstract pulse template.

The user can declare an abstract pulse template with certain properties like defined_channels and parameter_names. If the property getter of a declared property is called, the property is marked as frozen. Calling the getter of a non-declared property raises an exception.

To instantiate an abstract pulse template it has to be linked to a "real" pulse template via link_to. All frozen properties need to be exactly identical to the properties of the linked pulse template. This ensures that calling the getter of a property always yields the same result for the same object.

@lumip thoughts?

[coveralls]

Pull Request Test Coverage Report for Build 1599

• 59 of 71 (83.1%) changed or added relevant lines in 1 file are covered.
• 3 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.2%) to 93.357%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
qupulse/pulses/abstract_pulse_template.py	59	71	83.1%

Files with Coverage Reduction	New Missed Lines	%
qupulse/utils/types.py	3	100.0%

Totals
Change from base Build 1589:	-0.2%
Covered Lines:	4682
Relevant Lines:	4947

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 1659

• 78 of 78 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.09%) to 93.567%

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Totals
Change from base Build 1657:	0.09%
Covered Lines:	4717
Relevant Lines:	4974

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💛 - Coveralls