Amptk

- bug fix where `ufits filter` did not rename fasta headers for OTUs that were mapped from the mock community
- changed filename of output OTUs from ufits cluster to `basename.cluster.otus.fa`

- added a check for `vsearch` version, need > v1.9.1

- updates to support looking at full length amplicons instead of trimming and padding. Only recommended to use if you know what you are doing

- minor fix of `ufits cluster` using `vsearch` where if read length `--length` was longer than actual length of reads then `vsearch` crashes. Now scripts calculate read length and adjust appropriately
- added some output to stdout for filter command to let users know where files are located

- minor fix to allow `vsearch` to work with older Ion Torrent Data where sometimes quality scores are greater than 41.

- added support for `vsearch` for pre-processing reads as well as mapping reads to OTUs. If `vsearch` is installed, scripts will use it automatically, otherwise default to Python and/or usearch
- fix bug in `ufits filter` that resulted in error if no index bleed filter or spike in barcode passed on argument line
- also a home-brew formula to install ufits. `brew tap nextgenusfs/tap` followed by `brew install ufits` will install the package as well as `bedtools` and `vsearch` two optional dependencies. `usearch` must still be installed manually.