Add the new position value "tarec".
Most of this change could be done automatically either just by adding
the position to the obvious counterpart, or by grouping the other
elements into one thing and then giving that new group a "tarec"
position.
There were some exceptional cases where "tare" had been added to the
parent of the actual tare element. There was one very weird case
081ba.svg where the grouping was too eccentric to be able to keep, so
I removed the inner groups.
066f2-KaishoVtLst had a different Nelson radical than 066f2.svg
Two or three strokes in kanji files were missing kvg:type information
completely.
Two or so attributes were mis-ordered
This file seems to be just a list of the CJK stroke types from
Unicode. Further, it includes various simplified Chinese strokes which
don't occur in KanjiVG, so presumably it was never checked against the
data.
Most of this is automatically edited. About 300 cases were simple
addition of the nyoc group to whichever of a pair of groups lacked the
position element, then about 50 or so cases were re-grouping of the
counterpart elements into a single group and adding the nyoc position,
and then there were a few cases such as 051a0.svg of grouping errors
in the existing files, where the nyo counterpart had falsely been made
a child of the nyo group which had to be hand edited.
There were no other types of errors as far as I could see, and this
now covers every case of "nyo" position in the kanji directory.
Also remove a lot of small groups containing only one path which
seemed to have caused the creator of this file much confusion.
Also put the Nelson radical on the correct stroke
This uses a script to remove all of the duplicate radicals. I spot
checked the geometry, and it seems that the first group is always the
right one to keep, because of the stroke order, so I just removed all
the other radical values on groups except the first one. I did not
actually go to the trouble of sorting the geometries in order since
there didn't seem to be any exceptions to the "first is upper left"
rule.
Change radical variant to ⻞ where appropriate
Otherwise change the radicals to the correct variant or otherwise fix
grouping errors related to radicals and their expected stroke count.
The position value indicates where the element lies with respect to
other elements, but these elements have "position" set where the
element is the outermost one which represents the entire set of
strokes, in other words there is no other element to be relative to,
so the position seems to be useless.
