backup tools bup, storeBackup: implement sanity check
Merge branch 'experimental/updates' into refs/top-bases/experimental/marc

* experimental/updates:
  backup tools bup, storeBackup: implement sanity check
Merge commit 'refs/top-bases/experimental/marc' into experimental/marc

* commit 'refs/top-bases/experimental/marc':
  backup tools bup, storeBackup: implement sanity check
backup tools bup, storeBackup: implement sanity check

bup:
- update
- run make test (all tests seem to pass :-)
- add python.modules.readline
- add comment that there is no way to prune old revisions (yet)

Conflicts:
	pkgs/tools/backup/bup/default.nix
Merge branch 'experimental/updates' into refs/top-bases/experimental/marc

* experimental/updates:
  backup tools bup, storeBackup: implement sanity check
Merge commit 'refs/top-bases/experimental/marc' into experimental/marc

* commit 'refs/top-bases/experimental/marc':
  backup tools bup, storeBackup: implement sanity check