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Just my two cents here : I perfectly see that detecting unmached names
on ERC will give lots of false errors, but what about taking the problem
from the other end, and when adding label to a wire having a little list
with all the already used labels that appears and let you chose the one
you want ? (or explicitely create a new one if needed, just like words
proposals in openoffice or in source code editors)
This way you will have nearly zero missplelling errors, without a need
to check them with ERC.