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/350-deps/basic/.gitignore

@@ -0,0 +1,2 @@
+*.log
+*.out

t/350-deps/basic/1.in

@@ -0,0 +1 @@
+this is 1

t/350-deps/basic/2.in

@@ -0,0 +1 @@
+this is 2

t/350-deps/basic/clean.do

@@ -0,0 +1,2 @@
+rm -f *~ .*~ *.log *.out
+

t/350-deps/basic/default.out.do

@@ -0,0 +1,3 @@
+redo-ifchange $2.in
+echo $$
+echo $$ >>$2.log

t/350-deps/basic/test.do

@@ -0,0 +1,13 @@
+rm -f *.out *.log
+
+../../flush-cache
+redo-ifchange 1.out 2.out
+[ "$(cat 1.log | wc -l)" -eq 1 ] || exit 55
+[ "$(cat 2.log | wc -l)" -eq 1 ] || exit 56
+../../flush-cache
+touch 1.in
+redo-ifchange 1.out 2.out
+[ "$(cat 2.log | wc -l)" -eq 1 ] || exit 58
+. ../../skip-if-minimal-do.sh
+[ "$(cat 1.log | wc -l)" -eq 2 ] || exit 57
+