[Developers] Modification to input of -cbs and -gbs

[Allan Hicks]

Ian Taylor and I just posted a document discussing the results of 
testing different values of cbs and gbs for a large ADMB model (SS3).  
One thing that we learned is that when using the command line to set 
-gbs and -cbs (and -ams) it uses an integer data type. However, it seems 
that the code for the calculations associated with the buffers (excuse 
my ignorance) uses a long data type.  This limits the inputs to values 
less than 2^31 and a total memory allocation around 2Gb.  Linux uses 
64-bits to store long integers, thus we made a simple change to how the 
command line inputs are read in (used long) and were able to allocate 
12Gb to an ADMB program.  However, Windows uses 32-bits for a long 
integer, thus this change makes no difference in Windows (I have no clue 
about macs).

I made these changes to the xmodel3m.cpp file and attempted to add some 
Doxygen comments. I did not attempt to change any of the memory 
allocation warnings in gs_set.cpp that still reference 16-bit systems.  
I do not feel I understand the gradstack or cmpdiff buffers enough to do 
this intelligently. 

I am wondering if this change would be useful to add to the source code, 
and I am curious of the process to make changes to the source code and 
how these changes are verified or moderated.

Thanks,
Allan

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