[Ecls-list] Latest changes

[Juan Jose Garcia Ripoll]

* System design:

  - The bytecodes compiler now works with character arrays. Bytecodes
    are thus 8 bits large, while their arguments are 16 bits large.
    Lisp objects referenced in the code are kept in a separate array
    to simplify garbage collection. This strategy limits the size of
    bytecode objects to about 32000 bytes and about 32000 constants,
    but reduces the use of memory by about 25%.

  - Macros are implemented in C as functions with two arguments.
    Argument checking is thus left to funcall() and apply(), saving
    space (3k).

  - AND, OR and WHEN are now just macros, without any special
    treatment in the bytecodes compiler.

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