Version 4.0.1

Bugfix / enhancement release:

• Add capability to use fasta formatted read files (resolves #114)
• Add ability to work with genomes where one or more chromosomes is larger than ~500Mb. (resolves #118, #119 )
• Precheck for all required executables at start of run (resolves #115)
• Add documentation to README for solving some common issues with conda / bioconda configuration (resolves #122)