cvsection header must be 3 characters or longer due to font colouring

[Erwan-BR]

If one of the cvsection has a space in the first 3 caracters, the space is just deleted and the two words are attached.

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[OJFord]

Duplicate of #471, I suppose I'll leave this open though to have an actual issue (vs discussion) tracking it.

PR very welcome.

[dcsim]

This is a result of spaces not being tokenized and thus removed.

Use a ~ instead of a space or a \ , similar to how you use a \& instead of just &.

[OJFord]

That's true, I was responding above to the different issue alluded to in the title: that you can't even compile with a header <3ch. We should fix that, and I suppose ideally the colouring would stop at the first word in the case it's <3ch and followed by a space.