Updates for forthcoming 0.5.2 release.

Changes

@@ -1,3 +1,24 @@
+AWK & field-parser/record-reader routines shifted over to SREs.
+
+SRE regexp system installed.
+
 BEGIN process forms are now wrapped in a stdio->stdports call, so the
     body sees the I/O environment established by the pf's EPF.
 
+New char-sets and predicates:
+    printing blank control punctuation hex-digit ascii empty full
+This gives full coverage of the Posix character classes
+New char-set operations.
+Space removed from char-set:graphic -- this was a bug wrt Posix definitions.
+char-set-union and char-set-intersection now n-ary
+
+Fixed bug with interrupt system that prevented sigalrm from being
+caught by scsh programs.
+    Mike Sperber & Kevin Esler
+
+Dmitrii Pasechnik <D.Pasechnik@twi.tudelft.nl>
+bug in delete code
+
+reduce -> foldl (reduce-port, reduce-char-set)
+
+FILE-MATCH still treats strings as Posix regexps; now accepts regexp args, too.