build: Rename autogen.sh script to bootstrap to conform to GNU guidelines. * bootstrap: renamed from autogen.sh. * autogen.sh: deleted. * build-aux/bootstrap_gnulib: renamed from bootstrap. * build-aux/bootstrap: deleted. * build-aux/bootstrap_gnulib.conf: renamed from bootstrap.conf. * build-aux/bootstrap.conf: deleted. * Makefile.am: add bootstrap and bootstrap_gnulib to EXTRA_DIST. * contrib.txi, HACKING, README.MacOS, README.MinGW, mx-ops, sparse-mx-ops, vx-ops: Replace references to autogen.sh with bootstrap.

--- a/liboctave/operators/sparse-mx-ops
+++ b/liboctave/operators/sparse-mx-ops
@@ -16,7 +16,7 @@
 # along with Octave; see the file COPYING.  If not, see
 # <http://www.gnu.org/licenses/>.
 
-# NOTE: if this file changes, you must run autogen.sh and configure to
+# NOTE: if this file changes, you must run bootstrap and configure to
 # rebuild the source file lists for Make.
 
 # types