[devel] Removed spurious tabs, shorten long lines (no source change)

Also added scripts/chkfmt to validate the format of all the files that can
reasonably be validated (it is suggested to run "make distclean" before
checking, because some machine generated files have long lines.)
Reformatted the CHANGES file to be more consistent throughout.

autogen.sh

@@ -4,22 +4,22 @@
 #
 # WARNING: if you run this you will change the versions
 # of the tools which are used and, maybe, required!
-        touch Makefile.am configure.ac
+touch Makefile.am configure.ac
 {
-	echo "running libtoolize" >&2
-	libtoolize --force --copy --automake
+   echo "running libtoolize" >&2
+   libtoolize --force --copy --automake
 } && {
-	echo "running aclocal" >&2
-	aclocal
+   echo "running aclocal" >&2
+   aclocal
 } && {
-	echo "running autoheader [ignore the warnings]" >&2
-	autoheader
+   echo "running autoheader [ignore the warnings]" >&2
+   autoheader
 } && {
-	echo "running automake" >&2
-	automake --force-missing --foreign -a -c
+   echo "running automake" >&2
+   automake --force-missing --foreign -a -c
 } && {
-	echo "running autoconf" >&2
-	autoconf
+   echo "running autoconf" >&2
+   autoconf
 } &&
-	echo "autogen complete" >&2 ||
-	echo "ERROR: autogen.sh failed, autogen is incomplete" >&2
+   echo "autogen complete" >&2 ||
+   echo "ERROR: autogen.sh failed, autogen is incomplete" >&2