replace local function 'allk' with 'tower'

diff --git a/src/algebra/algfact.spad b/src/algebra/algfact.spad
index adecf599..b1e847c2 100644
--- a/src/algebra/algfact.spad
+++ b/src/algebra/algfact.spad
@@ -167,19 +167,17 @@
      fact    : (UP,  List K) -> FR
      ifactor : (SUP, List K) -> Factored SUP
      extend  : (UP, N) -> FR
-    allk    : List AN -> List K
      downpoly : UP  -> UPQ
      liftpoly : UPQ -> UP
      irred?  : UP  -> Boolean

-    allk l       == removeDuplicates concat [tower x for x in l]
      liftpoly p   == map(x +-> x::AN,  p)$UPCF2(Q, UPQ, AN, UP)
      downpoly p   == map(x +-> retract(x)@Q, p)$UPCF2(AN, UP , Q, UPQ)
      ifactor(p, l) == (fact(p pretend UP, l)) pretend Factored(SUP)
-    factor p     == fact(p, allk coefficients p)
+    factor p     == fact(p, tower coefficients p)

      factor(p, l) ==
-      fact(p, allk removeDuplicates concat(l, coefficients p))
+      fact(p, tower removeDuplicates concat(l, coefficients p))

      split p ==
        fp := factor p

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