ohnosequences/mg7: mg7 v1.0.0-M5

This milestone doesn't add many new features, but rather focuses on the internal code improvements and testing with a new reference database and several datasets. Here are the main changes since the v1.0-M4 release:

• #71, #113: BLAST output filtering based on the maximum pident is now configurable
• #112: Breaking changes to the way MG7 pipelines are defined and used in the user code: thanks to the improvements in Loquat user doesn't need to write boilerplate code to define an MG7 pipeline.
• #107, #63: Stats and Summary steps are removed from the pipeline
• #84, #96, #97, #98, #99: Global code review and refactoring
• #78: Switched to the CSV format for all tables
• #95: Bio4j taxonomy-related code is now in a separate project: ohnosequences/ncbitaxonomy
• #86, #102 : Added Illumina and Pacbio BEI mock communities as test pipelines

See the full list of pull requests merged in this release in the v1.0-M4 milestone.