Script to measure form performance regression

[countvajhula]

Summary of Changes

This adds a script to make it easier to generate the form performance regression analysis across different versions. To use it:

# on the earlier commit
$ make form-performance-report > /path/to/before.json

# on the later commit
$ make form-performance-report > /path/to/after.json

# then run the performance regression script
$ cd qi-sdk/profile/
$ ./regression.rkt /path/to/before.json /path/to/after.json

The PR also includes other a few other improvements to the performance scripts:

• supporting CSV output format in the forms performance report. In case we want to graph anything using graphite, CSV is a more common input format there
• adds some missing makefile targets for the SDK
• misc tidying

Public Domain Dedication

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