ignore-file rule modifications
bumping file format DB::version to 2 (not finished yet): contains the ignore_file_rules set
unignore-id rule command now properly uses the ID instead of the name
link_object: honor ignore_file_rules
DB::link_object now wants to knwo the owning-package
linking objects to their owners so we can use a by-package library path
rule commands to modify the pkg_ld path
fix -R option; info output for package lib paths
db format 2: now writing per-package library-path
--ld-delete now also accepts numeric values