Let users add new projects

Richard H. asked that:

"Research" folks can add their own reference, say by linking to a fasta with a different project (and once added, that reference can exist from then on).
So that if we want to test, say, measles or Zika, we can just add them.

In order to keep the runs reproducible, we can't let users change the pipeline itself. Instead, add another input file with extra seed references and coordinate references.

• load extra config file from project_config.py
• pass extra config file to project_config.py from all the steps
• let users create a new project in MiCall and link to it from the layout page
• build extra config file in MiSeq monitor (look for project names that aren't in regular project config file)

Start by tracing project_config.py through all pipeline steps, then inspect how MiSeq monitor identifies project names and how the layout page links projects. Done means an extra config file can supply seed and coordinate references without changing the pipeline, users can create and link projects in MiCall, and unknown project names produce that file.