Add test for declarative nix path primop
Make import syntactic sugar for importWithSettings
Make it possible to override the parse settings in evalFile
Pass the current parse settings in the import->importWithSettings sugar
importWithSettings: Initialize a ParseSettings from the settings argument
Expand __curSettings to the nixexpr repr of the current ParseSettings
Fix reference to builtins.import in nix-env.cc
Document nix-path
release.nix: add knobs to disable tests and pdf manuals to reduce build times/deps
Use value equality to check for noPos before calling posToXML