Merge changes from topic "flicker"

* changes:
  Print a checksum for each trace file upon error
  Support compound flicker assertions
  Allow assertions to ignore the beginning of a trace
tree: dc61d1615dd85a1e808b254b138e26815da11628
  1. build/
  2. docs/
  3. emu_test/
  4. libraries/
  5. scripts/
  6. tests/
  7. utils/
  8. PREUPLOAD.cfg