For Prerel 5.2.1:
  The initial value of ScalarSlots on DataObjects was changed from 0 to NaN.

==========
CVS Notes: (14-Jan-2010)
==========

Short Description: Initial value of new ScalarSlots on DataObjs should be NaN.
Bug Number: n/a
Release notes (y/n): Yes
For Release Nums: 5.2.1

Initial value of new ScalarSlots should be NaN rather than 0.  This had
not the case for ScalarSlots on DataObjects (but HAD BEEN typical for
for ScalarSlots on engineering objects).

-----------------
Sim/SlotProxy.cpp
-----------------

In method: SlotProxy* SlotProxyFactory::createProxy(..), for Scalar Slots,
provide an initial value of INVALIDVALUE (NaN) instead of 0.

  OLD: return new ScalarSlotProxy (name, 0, NOUNITS, atrBits);
  NEW: return new ScalarSlotProxy (name, INVALIDVALUE, NOUNITS, atrBits);

The effect of this code change is apparent on new ScalarSlots on
DataObjects.  It was TESTED also with REGRESSION TESTS on both
Windows and Solaris. Good.


==============
RELATED CHANGE (16-Jan-2010)
==============

-----------------
Sim/SlotProxy.cpp
-----------------

Coding error related to Scalar Slot Proxies.  We didn't see a behavioral
problem with this, but clearly the code here was incorrect. [Also confirmed
with Bill].

Methods (constructors):
 (1) ScalarSlotProxy::ScalarSlotProxy (const RWCString&,
                                        unit_type, Slot::AttributeBits)
 (2) ScalarSlotProxy::ScalarSlotProxy (const RWCString&, double value,
                                        unit_type, Slot::AttributeBits)

   OLD: typeBits |= Slot::SeriesSlotBit;
   NEW: typeBits |= Slot::ScalarSlotBit;

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