Run the report framework on multiple sets of results.

I would like to be able to run different tests on different architectures, and then merge the results into a single report.

Examples could be comparing different architectures (e.g. OSX or linux) or comparing different encoders that may only be available on certain architectures (e.g. Nvidia's h264 hardware encoder, vs. OSX Hardware encoder).

No files, tests, or entry points are named in the issue. Start by locating the report framework and how it currently accepts and combines one result set; done means separate test runs can be compared across architectures or encoders and emitted as one report.

Written by the indexing model from the issue text.