Produce a meta output file with the complete program description

[blakejohnson]

i.e. we want to have:

• [x] a dictionary from instruments to their compiled sequence files
• [x] some equivalent information for receivers/digitizers (#91)
  • [ ] including some representation of the difference between a segment and a capture event (i.e. if there are multiple MEASs in a sequence
• [x] label information for swept parameters. Done in #65