Implement GH Issue #620: Add tail() Netscript function

doc/source/netscript/basicfunctions/tail.rst

@@ -0,0 +1,29 @@
+tail() Netscript Function
+==================================
+
+.. js:function:: tail([fn], [hostname/ip=current ip], [...args])
+
+    :param string fn: Optional. Filename of script to get logs from.
+    :param string ip: Optional. IP or hostname of the server that the script is on
+    :param args...: Arguments to identify which scripts to get logs for
+    :RAM cost: 0 GB
+
+    Opens a script's logs. This is functionally the same as the
+    :ref:`tail_terminal_command` Terminal command.
+
+    If the function is called with no arguments, it will open the current script's logs.
+
+    Otherwise, the `fn`, `hostname/ip,` and `args...` arguments can be used to get the logs
+    from another script. Remember that scripts are uniquely identified by both
+    their names and arguments.
+
+    Examples::
+
+        // Open logs from foo.script on the current server that was run with no args
+        tail("foo.script");
+
+        // Open logs from foo.script on the foodnstuff server that was run with no args
+        tail("foo.script", "foodnstuff");
+
+        // Open logs from foo.script on the foodnstuff server that was run with the arguments [1, "test"]
+        tail("foo.script", "foodnstuff", 1, "test");