Clean up the code in bin/ to reduce warnings from GCC3.

Clean up the code in bin/ to reduce warnings from GCC3.

Stage 4 of 5 or so: cleanups to ed and ps.
- Add ``const'' and ``static'' to  appropriate variable delcarations
  and casts.
- Fix signedness on appropriate ``int'' declarations.
- Convert appropriate ``int'' types to ``size_t''.
- Rename functions/variables to not conflict with globals.
- Add missing #include's.

Submitted-by: Simon 'corecode' Schubert <corecode@fs.ei.tum.de>