mdsplus8: the v7 versions of MDSplus should check to see if accessing a v8 tree about mdsplus HOT 1 OPEN

Many customers will not be able to switch all of their mdsip servers and client workstations to mdsplus8 at once. Some sites thus will have a mixture of both versions of MDSplus (v7 and v8) and also both tree formats (12-char and 63-char). Thus, it is important to add features to v7 to ensure it informs the user that v7 cannot use 63-char format trees.

Note that this means testing all v7 features / components (mdsip client/server communication, mdstcl, jTraverser, actions, events, devices, etc.) with 63-char trees. No segfaults should occur. Instead there should be meaningful error messages / warnings as soon as it is detected that v7 is dealing with a 63-char tree.

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