- Verify capabilities mentioned in the wiki:
 `- https://wiki.archlinux.org/index.php/AUR_helpers#Build_and_search
- Test gpg-Signatures for git-packages.
- get_pkgbase: There is only one pkgbase per package.
- Use git-diff instead of cp and diff.
 `- Or at least use ln (instead of cp)
- fetch PGP keys, maybe optionally.
- "bootstrapping of packages"
 `- see https://github.com/polygamma/aurman/wiki/Description-of-the-aurman-dependency-solving
- Differentiate between normal and make dependencies.
- Allow several arguments (packages) to install.