[ide] Dynamic printing width.

The IDE now gets core Coq's `std_ppcmds` document format which is
width-independent.

Thus, we follow [1] and make the `{proof,message}_view` object refresh
their contents when the container widget changes size (by listening to
GTK's `size_allocated` signal). The practical advantage is that now
CoqIDE always renders terms with the proper printing width set and
without a roundtrip to Coq.

This patch dispenses the need for the `printing width` option, which
could be removed altogether.

[1] http://stackoverflow.com/questions/40854571/change-gtksourceview-contents-on-resize/

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