Several test-driven fixes

- Improved test suite exposed several issues with the handling of
command line arguments which are now fixed
- Fixed a race condition that would cause remote characters to be
  lost intermittently when running remote commands that finish
  immediately.
- Added automated testing that actually spins up a random listener
  and initiator in a private Reticulum network and passes data
  between them, uncovering more issues which are now fixed.
- Fixed (hopefully) an issue where `rnsh` doesn't know what
  version it is.

tests/test_args.py

@@ -0,0 +1,77 @@
+import rnsh.args
+import shlex
+import docopt
+
+def test_program_args():
+    docopt_threw = False
+    try:
+        args = rnsh.args.Args(shlex.split("rnsh -l -n one two three"))
+        assert args.listen
+        assert args.program == "one"
+        assert args.program_args == ["two", "three"]
+        assert args.command_line == ["one", "two", "three"]
+    except docopt.DocoptExit:
+        docopt_threw = True
+    assert not docopt_threw
+
+
+def test_program_args_dash():
+    docopt_threw = False
+    try:
+        args = rnsh.args.Args(shlex.split("rnsh -l -n -- one -l -C"))
+        assert args.listen
+        assert args.program == "one"
+        assert args.program_args == ["-l", "-C"]
+        assert args.command_line == ["one", "-l", "-C"]
+    except docopt.DocoptExit:
+        docopt_threw = True
+    assert not docopt_threw
+
+def test_program_initiate_no_args():
+    docopt_threw = False
+    try:
+        args = rnsh.args.Args(shlex.split("rnsh one"))
+        assert not args.listen
+        assert args.destination == "one"
+        assert args.command_line == []
+    except docopt.DocoptExit:
+        docopt_threw = True
+    assert not docopt_threw
+
+def test_program_initiate_dash_args():
+    docopt_threw = False
+    try:
+        args = rnsh.args.Args(shlex.split("rnsh --config ~/Projects/rnsh/testconfig -s test -vvvvvvv a5f72aefc2cb3cdba648f73f77c4e887 -- -l"))
+        assert not args.listen
+        assert args.config == "~/Projects/rnsh/testconfig"
+        assert args.service_name == "test"
+        assert args.verbose == 7
+        assert args.destination == "a5f72aefc2cb3cdba648f73f77c4e887"
+        assert args.command_line == ["-l"]
+    except docopt.DocoptExit:
+        docopt_threw = True
+    assert not docopt_threw
+
+
+def test_program_listen_config_print():
+    docopt_threw = False
+    try:
+        args = rnsh.args.Args(shlex.split("rnsh -l --config testconfig -p"))
+        assert args.listen
+        assert args.config == "testconfig"
+        assert args.print_identity
+        assert args.command_line == []
+    except docopt.DocoptExit:
+        docopt_threw = True
+    assert not docopt_threw
+
+
+def test_split_at():
+    a, b = rnsh.args._split_array_at(["one", "two", "three"], "two")
+    assert a == ["one"]
+    assert b == ["three"]
+
+def test_split_at_not_found():
+    a, b = rnsh.args._split_array_at(["one", "two", "three"], "four")
+    assert a == ["one", "two", "three"]
+    assert b == []