Most of the changes inspired from the "fr-latin9" map from Linux, but I
went with a different mapping because we also want some symbols later
introduced in Unicode, and also because we already had a different (and
I think better) mapping for some of the extra symbols in latin-9.
The keymap now features:
* Uppercase accented vowels, cedilla, spanish n with tilde
* Mathematical symbols for multiplication/division
* Spanish reverse exclamation and interrogation points, and interrobang
* Various other symbols from the latin-9 character set
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