URL Bonanza

Comparisons

• "contain" is now "contains"
• Added "is-null", "is-empty", "is-true", "is-false".

Extractors

• "txn-conf"
• "ua-req-url", "proxy-req-url"
• Pre-remap (pristine) URL extractors.
• Remap rule URL extractors.

Fixes

• Regular expression capture groups.
• Corruption of active feature.
• "txn-conf" directive no longer requires explicit terminal null.

Improved testing.
Large documentation updates.