Fix make results

[nasbyj]

The recently added make results target doesn't work, because by default make installcheck aborts make if the test fails. Add a installcheck_no_fail target that uses a separate make process and some shell trickery to avoid this.

[theory]

Is this ready to pull in, @nasbyj?

[theory]

I'm not sure it would even work then, @nasbyj, because it wouldn't capture all the variants:

ll test/expected | grep '_\d\.out$'
-rw-r--r--  1 david  staff   5.3K Dec  5 13:00 inheritance_1.out
-rw-r--r--  1 david  staff   5.3K Dec  5 13:00 inheritance_2.out
-rw-r--r--  1 david  staff   5.2K Dec  5 13:00 inheritance_3.out
-rw-r--r--  1 david  staff   1.8K May 21 17:45 runjusttests_1.out
-rw-r--r--  1 david  staff   1.6K May 21 17:45 runjusttests_2.out
-rw-r--r--  1 david  staff   1.6K May 21 17:45 runjusttests_3.out
-rw-r--r--  1 david  staff   1.2K May 21 17:45 runjusttests_4.out
-rw-r--r--  1 david  staff   1.8K May 21 17:45 runjusttests_5.out
-rw-r--r--  1 david  staff   1.2K May 21 17:45 runjusttests_6.out
-rw-r--r--  1 david  staff   5.9K May 21 17:45 runtests_1.out
-rw-r--r--  1 david  staff   5.9K May 21 17:45 runtests_2.out
-rw-r--r--  1 david  staff   5.6K May 21 17:45 runtests_3.out
-rw-r--r--  1 david  staff   4.3K May 21 17:45 runtests_4.out