Added getServerMaxRam and getServerUsedRam, deprecated getServerRam

doc/source/netscript/basicfunctions/getServerUsedRam.rst

@@ -0,0 +1,15 @@
+getServerUsedRam() Netscript Function
+=====================================
+
+.. js:function:: getServerUsedRam(hostname)
+
+    :RAM cost: 0.05 GB
+    :param string hostname: Hostname of target server.
+    :returns: Used ram on that server. In GB.
+
+    Example:
+
+    .. code-block:: javascript
+
+        usedRam = getServerUsedRam("harakiri-sushi"); // returns: 5.6
+        print("harakiri-sushi uses "+usedRam + "GB");