Target specific primers

[dr-joe-wirth]

Is your feature request related to a problem?
Users may want to restrict primers to specific genomic loci.

Describe the solution you'd like
Use bedtools to keep primer pairs whose products intersect with the loci of interest.

[dr-joe-wirth]

The workflow should be described instead of added directly to the main program. Maybe I can write a small wrapper for it, but I need to think carefully so as to avoid feature bloat.

[dr-joe-wirth]

As of v1.5.1, primerForge outputs BED files. This is no longer a feature request but instead an example of how to do this could be added to the README.