* lib/Automake/tests/Makefile.am, lib/Automake/tests/Conditional.pl,

* lib/Automake/tests/Makefile.am, lib/Automake/tests/Conditional.pl,
lib/Automake/tests/ConditionalSet.pl: New files.
* lib/Automake/Makefile.am (SUBDIRS): New variable.
* configure.in: Output lib/Automake/tests/Makefile.
* lib/Automake/ConditionalSet.pm (by_conditions): Delete.
(conds): Don't use by_conditions, sort alphabetically, and
return sorted conds.
(string): Call ->string on each Conditional.
* tests/Makefile.am (TESTS): Remove cond12.test.
* tests/cond12.test: Remove, moved to
lib/Automake/tests/ConditionalSet.pl.
* tests/cond3.test: Adjust conditional ordering.