Remove "open" test with 5 tests using "tryopen".
No change in testing coverage, but better extensibility.

--HG--
branch : HEAD

regress/open_nosuchfile.test

diff --git a/regress/open_nosuchfile.test b/regress/open_nosuchfile.test
new file mode 100644
index 0000000..bd70a74
--- /dev/null
+++ b/regress/open_nosuchfile.test
@@ -0,0 +1,5 @@
+# zip_open: file doesn't exist
+program tryopen
+args nosuchfile
+return 1
+stdout opening `nosuchfile' returned error 11/2