[Kst] kdeextragear-2/kst/kst [POSSIBLY UNSAFE]

[George Staikos]

CVS commit by staikos: 

- much more work on the interpreter and parser
- hook in a demo with timings to demonstrate how much faster we are
- interpret most of the old functions

result: new code, with function calls, takes 1/3 the amount of CPU time as the
        old parser.  In the absence of function calls, the differential is much
        larger yet.  Constant folding and other optimizations could also be of
        use.


  M +68 -15    enodes.cpp   1.2
  M +20 -9     enodes.h   1.2
  M +41 -38    eparse.c   1.2 [POSSIBLY UNSAFE: printf]
  M +8 -6      eparse.y   1.2 [POSSIBLY UNSAFE: printf]
  M +76 -58    escan.c   1.2
  M +10 -0     escan.l   1.2
  M +35 -3     kstequationcurve.cpp   1.43