Added getServerMaxRam and getServerUsedRam, deprecated getServerRam

doc/source/netscript/basicfunctions/getServerMaxRam.rst

@@ -0,0 +1,15 @@
+getServerMaxRam() Netscript Function
+====================================
+
+.. js:function:: getServerMaxRam(hostname)
+
+    :RAM cost: 0.05 GB
+    :param string hostname: Hostname of target server.
+    :returns: Total ram available on that server. In GB.
+
+    Example:
+
+    .. code-block:: javascript
+
+        maxRam = getServerMaxRam("helios"); // returns: 16
+        print("helios has "+maxRam + "GB");