Changes:
- More fixes on pkg lock/unlock on 32bits
- Initial support for provides/requires
- Print which package is the reason for direct depend change
- Cleanup regression tests
- Allow pkg create -M ./plop.ucl -p ./plop.plist
- Deprecate --relocate
- add pkg -r <rootdir> option to allow easy cross installation
- export PKG_ROOTDIR in script to ease cross installation friendly scripts