test: Rename all tests to get rid of the ugly numbers in file names.

The numbers were meaningless, and they made it hard to find a file of interest.

Instead, we get the ordering we want by adding an explicit list of
tests to run to the notmuch-test script.

test/notmuch-test

@@ -8,16 +8,18 @@
 
 cd $(dirname "$0")
 
+TESTS="basic new search json thread-naming reply dump-restore uuencode threading-out-of-order author-reordering from-line-heuristics long-msgid encoding-issues"
+
 # Clean up any results from a previous run
 rm -r test-results >/dev/null 2>/dev/null
 
 # Run the tests
-for test in t[0-9][0-9][0-9][0-9]*.sh; do
+for test in $TESTS; do
-	./"$test"
+	./$test
 done
 
 # Report results
-./aggregate-results.sh test-results/t*-*
+./aggregate-results.sh test-results/*
 
 # Clean up
-#rm -r test-results
+rm -r test-results