[NSFW] comparison tags aliases

Background Pony #E92B
I think “measuring” doesn’t mean the same thing as, nor imply, “comparing”. eg. (explicit) >>2260211
Also, I see a lack of measuring going on in the “measuring contest” tag…perhaps those should get simply re-tagged as “size comparison”
Likewise, “comparing” can be in ways other than “size” (for example, shape), though admittedly I don’t see any tagged pictures that aren’t size comparison.
Of course, the tags that mean the exact same thing with synonyms or the word order reversed should get merged.
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