moved write_list_by_name underneath write_by name

[chrisbeardy]

just a tidy up, so all read_by_name methods are first then the write_by_names methods as opposed to jumbling them up

[coveralls]

Pull Request Test Coverage Report for Build 1504085023

• 19 of 19 (100.0%) changed or added relevant lines in 1 file are covered.
• 5 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.3%) to 94.174%

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Files with Coverage Reduction	New Missed Lines	%
pyads/testserver/testserver.py	5	90.76%
<!--	Total:	5		-->

Totals
Change from base Build 1475440781:	-0.3%
Covered Lines:	1665
Relevant Lines:	1768

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💛 - Coveralls

[stlehmann]

We can do that. Brings more shape to the codebase. Don't know why the coverage decreased but can see no issues here. I'll merge it anyway.