Exclude non-auth matches

[Thomas Kluyver]

E.g. If "//Poa annua// non L." is in a taxonset, selecting "//Poa annua// L." with strict_auth=False (the default) will match it. We should refuse to match non-auth names even when we're not being strict about authority.

[Thomas Kluyver]

When selecting matching names, exclude those with 'non X' authority conflicts.

Closes #7

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