Update autoconf/automake standards

Generated files config.guess config.sub depcomp install-sh ltmain.sh missing
and ylwrap have been moved to build-aux/

Ran autoupdate

Replaced AC_TRY_LINK/AC_TRY_COMPILE by AC_LINK_IFELSE/AC_COMPILE_IFELSE

Droped -I$(top_srcdir)/include from CFLAGS since AC_CONFIG_HEADERS already
adds the -I

Fixed bison detection

Added AM_PROG_AR as required by autoreconf -i -Wall

Updated NEWS and .gitignore

.gitignore

@@ -5,12 +5,10 @@
 .libs/
 aclocal.m4
 autom4te.cache/
-config.guess
+build-aux/
 config.log
 config.status
-config.sub
 configure
-depcomp
 dumptypes.c
 dumptypes.h
 Makefile.in
@@ -20,15 +18,11 @@ include/config.h
 include/config.h.in
 include/mdbver.h
 include/stamp-h1
-install-sh
 libmdb.pc
 libmdbsql.pc
 libtool
-ltmain.sh
 mdbtools.spec
-missing
 types.h
-ylwrap
 src/extras/mdb-hexdump
 src/gmdb2/gmdb2
 src/gmdb2/help/C/omf_timestamp