tdd test for bug 238
candidate fix for bug 238
Test handling of duplicate column names
remove unnecessary comment
Revert "remove unnecessary comment"

This reverts commit 5e1f7b6a85560147043a5da5612fac27ded5a677.
Add implicit column name test
TDD of broken schema inference
code cleanup
Resolve attribute names given indexes
Fix and test handling of unboxed indexes
implicit column names: one more test
Merge pull request #239 from uwescience/fix-238

candidate bug 238 fix