Description of the various user-defined functions for !Evaluate.

If you add any functions to the function-library called 'Functions', please
describe the function, ie. its calling convention, parameters, result,... in
this text-file, so that other users of !Evaluate may benefit from your ideas!
Please try to make your function-description conform with that of the first
seven descriptions...                              

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                 Descriptions of the User-defined Functions:
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MAX         : Parameters : two reals x,y
              Returns    : real, being the maximum of x and y
              Syntax     : MAX(x,y)
              Example    : MAX(4.02,10) = 10

MIN         : Parameters : two real x,y
              Returns    : real, being the minimum of x and y
              Syntax     : MIN(x,y)
              Example    : MIN(-9.3,MAX(4.02,10)) = -9.3

FAC         : Parameters : one integer x       
              Returns    : integer, being the factorial of x
              Syntax     : FAC(x)
              Example    : FAC(5) = 120

SEC         : Parameters : one real x
              Returns    : real, being the secans (1/COS) of x
              Syntax     : SEC(x)
              Example    : SEC(FAC(4)) = 2.357495262

COSEC       : Parameters : one real x
              Returns    : real, being the cosecans (1/SIN) of x
              Syntax     : COSEC(x)
              Example    : COSEC(12) = -1.863679599

MANDEL      : Parameters : two reals x and y (components of x+yi)
              Returns    : real, being the potential -relative to the
                           Mandelbrot Set- of the point x+yi
              Syntax     : MANDEL(x,y)
              Example    : MANDEL(-1.4,.3) = 0.01159676471

ITERATE     : Parameters : a string f$, a real x and an integer m
              Returns    : real, being the result of the function f$ iterated
                           m times, with initial value x
              Syntax     : ITERATE(f$,x,m)
              Example    : ITERATE("COS",123,100) = 0.7390851332
