First defined in: FKiSS3
For else, the conditional block is executed only if all
previous conditional blocks were false.
Example:
;@ ifequal(X, 1) ; If X equals 1 then show "doll.cel".
;@ map("doll.cel")
;@ else() ; Otherwise, X does not equal 1 so hide "doll.cel".
;@ unmap("doll.cel")
;@ endif()