alias newhalf -> futa_without_pussy

The bulk update request #31636 (forum #308302) has been rejected by @DanbooruBot.

BUR #44226 is pending approval.

create alias newhalf_with_male -> ndm_twosome
create alias newhalf_with_female -> ndf_twosome
create alias newhalf_with_newhalf -> ndnd_twosome
create alias futa_with_newhalf -> dnd_twosome

I think it's about time we actually did something with these. I cannot actually think of a good tag name that maintains the *_with_* formatting, so I'm instead stealing a page from topic #32439, less because I think these are good names and moreso to force the conversation. If "d" is for dickgirl, "nd" is for no pussy dickgirl.