these implementations can reliably update. This can be used to
avoid excessive revalidation of contents.
+ * Some platforms ship with old version of expat where xmlparse.h
+ needs to be included instead of expat.h; the build procedure has
+ been taught about this.
+
+ * "make clean" on platforms that cannot compute header dependencies
+ on the fly did not work with implementations of "rm" that do not
+ like an empty argument list.
Also contains minor documentation updates and code clean-ups.
* Command line completion code was inadvertently made incompatible with
older versions of bash by using a newer array notation.
+ * "git push" was taught to refuse updating the branch that is
+ currently checked out long time ago, but the user manual was left
+ stale.
+ (merge d9be248 wk/man-deny-current-branch-is-default-these-days later to maint).
+
* Some shells do not behave correctly when IFS is unset; work it
around by explicitly setting it to the default value.