removed tarballs from main branch

Initial support for linked reads, such as those produced by the 10x Genomics Chromium technology
Linked reads are supplied in the original SSAKE format, but the barcode information is indicated by sequence following a single underscore "_"
Added a C. elegans linked read data assembly script in the test folder
Scaffolding options consistent with that of the LINKS scaffolder
SSAKE no longer sorts by/prioritizes high multiplicity reads for assembly
Streamlined file names
Deprecated force-fill gap feature
Bug fixes

Implements targeted de novo assembly. Fixed a bug that manifested when running SSAKE in targeted (-s) de novo assembly mode. Contig sequences as long as the seed sequence were previously misclassified as singlets.