Modularise and generalise

Modularisation:
- Use new functions replace(), replace_line() and delete_line() instead
  of sed directly.
  This required all editing to be done in-line or pseudo in-line, i.e.
  moving files afterwards.

Generalisation:
- Make it work for both the non-vcs source and the binary packages, not
  only the former.
  A separate function handle_all() has been set up to handle both types.

Further:
- Require a directory to be supplied as argument due to a variable
  number of further arguments.
- Use a temporary directory instead of several files.
- Add option -uaf to forcibly update everything.

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