Use autoreconf for autogen.sh

Rename bootsrap.sh to autogen.sh. Probably this name more familiar. Use autoreconf for generation of autotools files.

autogen.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+autoreconf -fvi

bootstrap.sh

@@ -1,9 +0,0 @@
-#!/bin/sh
-
-mkdir -p aux_scripts m4
-libtoolize -c -i
-aclocal -I m4 --install
-autoheader
-automake -a -c
-autoconf
-