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/120-defaults-flat/.gitignore

@@ -0,0 +1,6 @@
+c
+c.c
+c.c.c
+c.c.c.b
+c.c.c.b.b
+d

t/120-defaults-flat/all.do

@@ -0,0 +1 @@
+redo-ifchange c d

t/120-defaults-flat/c.c.c.b.b.a

@@ -0,0 +1 @@
+chicken

t/120-defaults-flat/c.do

@@ -0,0 +1,3 @@
+redo-ifchange $1.c
+echo c.do
+cat $1.c

t/120-defaults-flat/clean.do

@@ -0,0 +1,2 @@
+rm -f c c.c c.c.c c.c.c.b c.c.c.b.b d \
+	*~ .*~

t/120-defaults-flat/default.b.do

@@ -0,0 +1,10 @@
+if [ -e "$1.a" -o -e "default${1#$2}.a" ]; then
+	redo-ifchange "$1.a"
+	echo a-to-b
+	cat "$1.a"
+else
+	redo-ifchange "$1.b"
+	echo b-to-b
+	cat "$1.b"
+fi
+../sleep 1.1

t/120-defaults-flat/default.c.c.do

@@ -0,0 +1,4 @@
+redo-ifchange $1.b
+echo b-to-cc
+cat $1.b
+../sleep 1.2

t/120-defaults-flat/default.c.do

@@ -0,0 +1,4 @@
+redo-ifchange $1.c
+echo c-to-c
+cat $1.c
+../sleep 1.3

t/120-defaults-flat/default.do

@@ -0,0 +1,4 @@
+redo-ifchange c
+echo default-rule
+cat c
+../sleep 1.4