MaSuRCA 4.0.5

This is a maintenance release that improves the stability of masurca scaffolder (soon to be published as SAMBA tool), and improves speed and consensus quality of the hybrid assemblies.
Major changes:

1. upgraded swig headers to version 4.0.2
2. fixed occasional division by zero bug in masurca scaffolder
3. removed the step of k-mer size reduction for the super-reads, it is not needed with the improvements that has been made recently
4. the masurca_scaffolder.sh tool has been renamed to samba.sh tool (manuscript in preparation)
5. The SAMBA tool can be used to close intrascaffold gaps when invoked through close_scaffold_gaps.sh script.