DO NOT MERGE YET — in progress implementation of character sets for Mesquite plugin

[balhoff]

Working with @DMaddison on reading character sets into Mesquite.

[rvosa]

Hi Jim,

do you need me to do anything with this? You have commit access so feel free to merge whatever is useful, obviously.

Rutger

[balhoff]

Thanks Rutger, this is just to show @DMaddison where I need some help from him to implement the Mesquite part. We'll add some commits to this and then merge when it's ready.

[rvosa]

Cool.