tests: more explicative names for few aclocal tests

tests: more explicative names for few aclocal tests

* t/aclocal3.sh: Rename ...
* t/aclocal-missing-macros.sh: ... like this.
* t/aclocal4.sh: Rename ...
* t/aclocal-deps.sh: ... like this.
* t/aclocal5.sh: Rename ...
* t/aclocal-deps-subdir.sh: ... like this.
* t/aclocal6.sh: Rename ...
* t/aclocal-remake-misc.sh: ... like this.
* t/aclocal7.sh: Rename ...
* t/aclocal-no-force.sh: ... like this.
* t/acloca8.sh: Rename ...
* t/aclocal-no-unused-required.sh: ... like this.
* t/acloca9.sh: Rename ...
* t/aclocal-I-order-1.sh: ... like this.
* t/acloca11.sh: Rename ...
* t/aclocal-I-order-2.sh: ... like this, and update heading comments.
* t/acloca12.sh: Rename ...
* t/aclocal-I-order-3.sh: ... like this, and update heading comments.
* t/acloca13.sh: Rename ...
* t/aclocal-m4-sinclude.sh: ... like this, and update heading comments.
* t/acloca14.sh: Rename ...
* t/aclocal-m4-include-are-scanned.sh: ... like this.
* t/acloca14.sh: Rename ...
* t/aclocal-m4-include-are-scanned-aclocal-amflags.sh: ... like this,
and update heading comments.
* t/acloca15.sh: Rename ...
* t/aclocal-scan-configure-ac-pr319.sh: ... like this.
* t/acloca16.sh: Rename ...
* t/aclocal-no-extra-scan.sh: ... like this, and enhance slightly.
* t/acloca18.sh: Rename ...
* t/aclocal-serial.sh: ... like this.
* t/acloca19.sh: Rename ...
* t/aclocal-pr450.sh: ... like this.
* t/acloca20.sh: Rename ...
* t/aclocal-no-symlinked-overwrite.sh: ... like this.
* t/acloca21.sh: Rename ...
* t/aclocal-comments-respected.sh: ... like this.
* t/acloca22.sh: Rename ...
* t/aclocal-deleted-header.sh: ... like this.
* t/acloca22b.sh: Rename ...
* t/aclocal-deleted-header-aclocal-amflags.sh: ... like this.
* t/acloca23.sh: Rename ...
* t/aclocal-underquoted-defun.sh: ... like this.
* t/list-of-tests.mk: Update.

Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>