Use long reads with spades

Limitation: Hybrid assembly of long and short reads is supported with spades and metaSpades. However metaSpades needs a paired-end short-read library.

The path of the (preprocessed) long reads should be added manually to the the sample table under a new column heading ‘longreads’.

In addition the type of the long reads should be defined in the config file: ` longread_type` one of [“pacbio”, “nanopore”, “sanger”, “trusted-contigs”, “untrusted-contigs”]