[Meta] Memory and runtime performance improvements

[standage]

Here I want to keep track of some ideas we've thought of and, in some cases, discussed to improve kevlar's memory consumption and speed. I'll link to relevant issue threads and pull requests as they come about.

• [ ] Buffer abundance queries in kevlar novel (see #208, #276)
• [ ] Use a faster hash function (see #209)
• [ ] Re-visit and re-evaluate error correction (#273)
• [x] Populate dedicated counttables for the kevlar simlike step, to enable higher FPR for kevlar novel step (#274)
• [ ] Investigate sketch composition so controls can be combined for kevlar novel step (#275).