modernize configure.ac; add .bzrignore

https://www.gnu.org/software/automake/manual/html_node/Public-Macros.html

.bzrignore

@@ -0,0 +1,43 @@
+# generic autoconf excludes
+Makefile
+Makefile.in
+/aclocal.m4
+/autom4te.cache
+/config.log
+/config.status
+/configure
+/install-sh
+/missing
+
+# generated from .in
+/etc/profile.d/Z97-byobu.sh
+/usr/bin/byobu
+/usr/bin/byobu-config
+/usr/bin/byobu-ctrl-a
+/usr/bin/byobu-disable
+/usr/bin/byobu-disable-prompt
+/usr/bin/byobu-enable
+/usr/bin/byobu-enable-prompt
+/usr/bin/byobu-export
+/usr/bin/byobu-janitor
+/usr/bin/byobu-launch
+/usr/bin/byobu-launcher
+/usr/bin/byobu-launcher-install
+/usr/bin/byobu-launcher-uninstall
+/usr/bin/byobu-layout
+/usr/bin/byobu-prompt
+/usr/bin/byobu-quiet
+/usr/bin/byobu-reconnect-sockets
+/usr/bin/byobu-select-backend
+/usr/bin/byobu-select-profile
+/usr/bin/byobu-select-session
+/usr/bin/byobu-shell
+/usr/bin/byobu-silent
+/usr/bin/byobu-status
+/usr/bin/byobu-status-detail
+/usr/bin/byobu-ugraph
+/usr/bin/byobu-ulevel
+/usr/lib/byobu/include/config.py
+/usr/lib/byobu/include/dirs
+/usr/lib/byobu/include/toggle-utf8
+/usr/share/byobu/tests/byobu-time-notifications

configure.ac

@@ -2,8 +2,9 @@
 # Process this file with autoconf to produce a configure script.
 
 AC_PREREQ([2.61])
-AC_INIT(byobu, 3.0, http://byobu.org)
-AM_INIT_AUTOMAKE(byobu, 3.0)
+AC_INIT([byobu], [5.111], [http://byobu.org])
+AC_CONFIG_SRCDIR([usr/bin/byobu.in])
+AM_INIT_AUTOMAKE([foreign])
 AC_PROG_LN_S
 
 # Checks for programs.