Fill in output_dir in mocked SRs to quiet warnings.
Avoid null in-clause warning when we know we have no IDs.
Replace confusing comments in result modules.
Merge pull request #361 from tmooney/quiet_composite_test_warnings

Quiet G:ID:Composite Warnings
bug fix
changed to defined
Merge pull request #365 from tmooney/replace_dv2_result_detector_pm_comments

Replace confusing comments in DV2 result modules.
Merge pull request #368 from dufeiyu/bug_fix

Resolve the warnings for G::M::T::Dbsnp::Import and G::M::C::Define::ImportedVariationList