Rename "Plasmid Genes" column

[apetkau]

It looks like the PlasmidFinder web server lists the plasmid incompatibility factors under a column named Plasmid:

We should maybe look at renaming the column Plasmid Genes in staramr to Plasmid to avoid confusion (or is there a better name?)

[apetkau]

In addition to rename in the summary table, please rename:

• Gene -> Plasmid in the PlasmidFinder table
• Gene -> Gene/Plasmid in the Detailed_Summary table

[jennifertran]

Closing issue as this has been merged