Function: exportall
Section: programming/specific
C-Name: exportall
Prototype: v
Help: exportall(): declare all current dynamic variables as exported variables.
Doc: declare all current dynamic variables as exported variables.
 Such variables are visible inside parallel sections in place of global variables.
 \bprog
 ? fun(x)=x^2+1;
 ? parvector(10,i,fun(i))
   ***   mt: please use export(fun).
 ? exportall()
 ? parvector(10,i,fun(i))
 %4 = [2,5,10,17,26,37,50,65,82,101]
 @eprog
