bug#73188: PEG: Fix bugs and add complex PEG for testing

[Ekaitz Zarraga]

Hi,

I decided to improve the tests of the PEG module because I wasn't very 
confident about the [^...] functionality, and I found I had some minor 
bugs in the previous patch.

I attach a new version of the previous commits with an extra one that 
adds an HTML parser and tests against it. That's what made me find some 
of the errors and missing bits.

With the test I feel more confident about the changes.

Thanks,
Ekaitz

v5-0003-PEG-Add-a-complex-PEG-grammar-test.patch
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v5-0002-PEG-Add-support-for-not-in-range-and.patch
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v5-0001-PEG-Add-full-support-for-PEG-some-extensions.patch
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