`.' in SUBDIRS changes order of builds:
* Makefile.am (SUBDIRS): Added `.'. Put tests last.
* tags.am (TAGS): Don't look for TAGS file in `.'.
* automake.texi (Top level): Document SUBDIRS change.
* automake.in (handle_installdirs): Create separate installdirs-am
target.
(handle_merge_targets): Don't put all-am onto @all. Fixed error
message. Correctly handle install-info. Give error if
install-info-local inappropriately defined. Don't special-case
install-data, install-exec, install, uninstall, or all.
(handle_subdirs): Don't push `-recursive' target names onto
corresponding lists.
(do_one_merge_target): Always define `-am' form of rule, and point
ordinary form to `-am' or `-recursive' as appropriate.
Special-case `all'.
(do_check_merge_target): Generate check-am target.
(handle_dist_worker): Use target_defined.
(handle_dist): Likewise.
(handle_merge_targets): Likewise.
(do_one_merge_target): Likewise.
(do_check_merge_target): Likewise.
(do_one_clean_target): Likewise.
(initialize_per_input): Initialize $all_target.
(do_one_clean_target): Always generate -am form of rule; other
changes for new SUBDIRS change.
(handle_clean): Always generate clean-am form of rule.
(handle_tags): Only build subdir if not `.'.
(handle_dist_worker): Skip `.' directory.
* subdirs.am: Allow `.' to be specified in SUBDIRS.