renamed sub mask_exons to sub mask_cds; added alias sub for mask_exons.  Changed sub mask_cds to only mask features of type CDS instead of CDS+various RNA genes.  Added sub mask_rna to mask any feature type containing 'RNA'
renamed sub mask_exons to sub mask_cds; added alias sub for mask_exons.  Changed sub mask_cds to only mask features of type CDS instead of CDS+various RNA genes.  Added sub mask_rna to mask any feature type containing 'RNA'

LyonsLab/coge,LyonsLab/coge,LyonsLab/coge,LyonsLab/coge,LyonsLab/coge,asherkhb/coge,asherkhb/coge,asherkhb/coge,asherkhb/coge,LyonsLab/coge,asherkhb/coge,asherkhb/coge,LyonsLab/coge,asherkhb/coge,asherkhb/coge,LyonsLab/coge,asherkhb/coge,LyonsLab/coge