gEDA-dev: tragesym improvements

[Aapo Tahkola]

Hi,

I made some improvements to tragesym in order to avoid problems with
pins on top/bottom:

-the difference between symwidth and calculated
symbol width will be added as pad to left and right sides

-if there are pins at top/bottom, place symbol name at center instead
of top-left

-vertical pin spacing can be less than 500 now

Small example attached.
Keep up the good work!

-- 
Aapo Tahkola
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