Fix tabor new visa

[shumpohl]

pyvisa finally removed ask (and changed the return value of write_raw?). Howerver, it was too much work to repair the old backend that I simply wrote a new smaller one. It is called tabor_control and available from PyPI.

[coveralls]

Pull Request Test Coverage Report for Build 2373

• 37 of 67 (55.22%) changed or added relevant lines in 3 files are covered.
• 5 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.05%) to 80.057%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
qupulse/hardware/feature_awg/features.py	3	5	60.0%
qupulse/hardware/awgs/tabor.py	23	35	65.71%
qupulse/hardware/feature_awg/tabor.py	11	27	40.74%

Files with Coverage Reduction	New Missed Lines	%
qupulse/hardware/awgs/tabor.py	5	76.27%

Totals
Change from base Build 2358:	0.05%
Covered Lines:	7198
Relevant Lines:	8816

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💛 - Coveralls