Package sisyphus: Information

- sisyphus_gen_contents: include alternatives-like virtual paths
  into contents_index file (e.g. /usr/bin/xvt -> /usr/bin/xvt)

- Removed migration scripts: sisyphus_migration_hack, sisyphus_update_classic.
- config: Removed unused variables.
- Removed obsolete components:
  base, castle, junior, kernel, master, contrib, non-free.
- sisyphus_unpaired: Renamed --safe-index to --save-index.

- sisyphus_movement: new program.
- sisyphus_cleanup_dups:
  + large reorganization;
  + --component removed;
- functions optimizations.