[Therion] extend

[Marco Corvi]

i think that extend should take values in the interval [-1,1], ie also
fractional values, plus some special value such as "ignore" to open loops,
and "undefined" to let the program choose, because it's a nuisance to enter
a decimal number for every shot (legs + splays).
therion uses the left/right normal/reverse etc. solution,

and users should be allowed to set extend also for splays, if they need to.

for now, let's use left/right/vert, and ignore only to open loops

btw, are vertical extend considered in the computation of the cave length
by therion ?

marco
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