couple of modifications for myads:

[golnazads]

1-first query switched the OR,
2-third query if db_key is PRE add a prefix bibstem:arxiv

[coveralls]

Pull Request Test Coverage Report for Build 209

• 6 of 6 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.01%) to 90.672%

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Totals
Change from base Build 207:	0.01%
Covered Lines:	661
Relevant Lines:	729

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💛 - Coveralls