create implication twin_drills -> twintails

Reason:

twin_hair implicates twintails and says "Can be combined with twintails to get the twin drills style."

It's similar to twin_braids and depends on the drills' position.

post #1135005 is twintails
post #1146123, post #1148240 are not.

post #1144283 is both, separate.

Agree with sleth, there are exceptions so we shouldn't implicate.

OK, point taken.