yat_am_macros tests fail

[Peter]

The following tests fail

FAIL: yat_prog_move_if_change_test.sh
FAIL: yat_revision_header_test.sh
FAIL: yat_svn_release_year_test.sh
FAIL: yat_svn_revision_test.sh

with following error message:

configure:2217: error: possibly undefined macro: AX_AC_APPEND_TO_FILE
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.
autoreconf: /opt/local/bin/autoconf failed with exit status: 1

Probably a missing file.

[Peter]

(In [2543]) add file needed by macros in yat_am_macros.m4. Change bootstrap function in common_defs so it copies all m4/*.m4 to local runtestdir rather than having aclocal doing that job, which implies no need to set -I top_srcdir/m4 in ACLOCAL_AMFLAGS in test Makefile.am. refs #670

[Peter]

(In [2547]) included needed m4 files in dist. fixes #670 (distcheck now works)