Bug fixes for reduced ram usage for --parse-by-seq + OrderMinHash

Reduce memory usage for --parse-by-seq. Extend --parse-by-seq documen…

…tation. Bug fix for indexing compressed representations.

Bug fix for --parse-by-seq with '--fastcmp-*' options.

Reduced logging. Bug fixes.

Writes k-mer sets to disk even without --cache-sketches to avoid bringing all data into memory.
Bump to C++20.

Major bug fixed: remove bug introduced at 12a4dd2 when downgrading ni…

…bble support.

Bug fixed: in static builds, the use of -flto was causing binary outp…

…uts when not requested.

Bug fixed: proper behavior of --outprefix and only storing individual…

… sketches if --cache-sketches is enabled

Add --union-size, bug fixes, and cleaned up documentation.

Bug fix release - containment corrections

Bug fix: emit poisson distances for --set/--countdict