2 1. Conversion program<->scheme_tree not completely correct:
3 Problem with the list () of length zero.
5 2. Other conversions to trees should be normalized.
6 Get rid of () [] {} (,) [,] {,}
8 3. Indices, color changes, etc.
9 -> change environment while typesetting.
10 -> but not when executing without typesetting.
12 4. Possible to distinguish between static and shared compilation
13 on sun systems by -dy and -dn flags. However, only a shared
14 version of ldl is available...