Defined a new command - \WRITEPOLYTERM - to  ...

... correctly render individual polynomial terms.
Usage: \startpoly\WRITEPOLYTERM{a}{b}\WRITEPOLYTERM{c}{d}
to write ax^b + cx^d

(a,b,c,d) have to be numbers. Handles negative powers. By default,
renders polynomial in x.
1/k3h part 1
Merge pull request #764 from abhinavc/master

1/k3h part 1