Sketchlib 1.7.4

New features:

• Sketching kernel overhaul: should be faster, and supports read datasets larger than the device memory size (#63 #64)
• Increase the size of the countmin table on GPUs to 2^30 columns, takes up about 30% of a 3090's memory (#64)
• Better progress meter for read sketching (#64)
• Save whether the DB was calculated using the reverse complement strand (#65)

Bug fixes:

• Fix indices for reference vs query distance calculations, hit when reaching ~100k queries (#64)
• If sketching craps out early, save the successful sketches up until that point to the HDF5 DB without corrupting it, so it can be joined later. (#64)

Other:

• Refactor the CUDA code a bit, putting classes into their own files. (#64)