add_type: Adds interaction type to dynamic differential network
In pcahan1/epoch: Dynamic GRN reconstruction from single cell RNA-Seq data

Adds interaction type to dynamic differential network

1	add_type(diffnet, type, grnDF_on, grnDF_offlist)

`type`	"on" or "off" depending on the type of differential network. If "on" will assign type based on grnDF_on. Otherwise interaction assigned from grnDF_offlist.
`grnDF_on`	the static network in which diffnet edges are active
`grnDF_offlist`	list of static networks in which diffnet edges are inactive