t/*: rearrange tests into numbered directories.

It was getting way too ad-hoc in there.  Let's reorganize the tests so that
there's a good, obvious, suggested sequence to run them in.

t/220-ifcreate/all.do

@@ -0,0 +1,21 @@
+rm -f exists ifcreate[12] ifcreate[12].log ifcreate[12].dep
+. ../skip-if-minimal-do.sh
+touch exists
+redo-ifcreate exists 2>/dev/null && exit 91
+rm exists
+redo-ifcreate exists || exit 92
+
+for d in 1 2; do
+	redo ifcreate$d
+	[ "$(wc -l <ifcreate$d.log)" -eq 1 ] || exit ${d}1
+	redo-ifchange ifcreate$d
+	[ "$(wc -l <ifcreate$d.log)" -eq 1 ] || exit ${d}2
+	../flush-cache
+	touch ifcreate$d.dep
+	redo-ifchange ifcreate$d
+	[ "$(wc -l <ifcreate$d.log)" -eq 2 ] || exit ${d}3
+	../flush-cache
+	rm ifcreate$d.dep
+	redo-ifchange ifcreate$d
+	[ "$(wc -l <ifcreate$d.log)" -eq 3 ] || exit ${d}4
+done