Procedures for integration in:
------------------------------

1) C[x]          intPol    := proc(f,x) ...
2) C(x)          intRat    := proc(f,x) ...
3) C(x)[ln(..)]  intPolLog := proc(f,x,theta) where theta=ln(..)
   intPolLog calls intRat for integration in C(x), or when intRat
   is not available then it uses int.
4) C(x,ln(..))   intRatLog := proc(f,x,theta). Uses intPolLog/intRat
   or uses int when those are not available.
5) C(x)[exp(..),1/exp(..)]
   intLaurentPolExp:=proc(f,x,theta) where theta=exp(..)
   Uses ratsols from DEtools package.
6) C(x, exp(..))  intRatExp:=proc(f,x,theta). Uses intLaurentPolExp.
7) C(x, ln(x), ln(ln(x)+x^2))  intNestedLog(f,x,theta1,theta2)
8) C(x, exp(x), ln(exp(x)+x))  intNestedExpLog(f,x,..)
9) Write one "intAll" procedure that determines the kind of
   input, figures out what the theta(s) are (if any) and calls
   the appropriate procedure. For example, start with something
   like.
   if not has(f,exp) and not has(f,log) then
	RETURN( intRat(f,x) )
   fi;
   Note: You can already start with this procedure even
   when the other ones are not yet ready (just do intRat:=int
   and do similar steps for procedures that are not yet
   written).