fix seq-len weirdness in hamming_max
fix zipped writing of files (and .gz extension)
make small, largely formatting, changes to main.c
fix the whole hamming-dist mode thing.
add plonk file to gitignore
alpha-ish version of fastDBarcode

Many and various changes:
- implement buffer sequence matching
- use manual vim folding
- small changes and bug fixes, particularly with realloc-ing stuff
- remove annoying debug prints
- add crumtrail counter for each file
- misc other stuff like making flag a static int and using it throughout
add extra/update test files