Normalize relative paths in mapref #1683
Clean maplink stylesheet
Clean maplink XSLT
Use tunnel parameters in maplink XSLT
Use () instead of #none# in maplink XSLT
Fix sibling links in map link #1683
Update library dependencies #1791
Upgrade to 2.0 release
Fix issues reported by IntelliJ IDEA
Remove NP plug-in #1512

Remove NP plug-in code, as most of the plug-in functionality has been
migrated to default preprocessing plug-in.