Remove dependence on POS tagset

[mbollmann]

Originally reported by: Marcel Bollmann (Bitbucket: mbollmann, GitHub: mbollmann)

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Traditionally, the GUI requires that at least a POS tagset is associated with each text, while every other tagset type is optional.

I don't see any reason to keep this restriction, since the tagset handling on the GUI side is completely modularized now. However, opening a text without an associated POS tagset still results in a crash, so apparently some parts of the code still rely on this assumption. Can we fix this?

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• Bitbucket: https://bitbucket.org/mbollmann/cora/issue/40

[mbollmann]

Original comment by Marcel Bollmann (Bitbucket: mbollmann, GitHub: mbollmann):

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Remove last POS tagset dependence (resolves #40)

[mbollmann]

Original comment by Marcel Bollmann (Bitbucket: mbollmann, GitHub: mbollmann):

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openFile reports "maxLinesNo" as 0 when there's no POS tagset