Revert "Add/remove implied dep on dedupe targets when sorting."

This reverts commit ff9849cfea2fcadfda7e90cf3b752462579b31df.
Revert "Handle deduped rows."

This reverts commit 23bb434af926f01f72feebbe899c122ec8705754.
Add regression test for dedupe dependencies.
Merge pull request #40 from jgoz/revert-dedupe-support

Revert dedupe dependency handling