Protect link formatting.
Remove dupes.
pkgwat dependants

Add support for querying package relationships:

pkgwat.api.dependencies -> "Requires"
pkgwat.api.dependants -> "Required By"
pkgwat.api.provides -> "Provides"
pkgwat.api.conflicts -> "Conflicts"
pkgwat.api.obsoletes -> "Obsoletes"