Remove 32-bit constraints (parent ticket)

[rsdunlapiv]

[anntsay]

there are places in ESMF that store ID as 32 bit integer.. but some group need more. not much was done in mesh yet.

areas to update (in the order of implementation dependencies):
Gerhard - (1) array (gerhard) (2) redist (Gerhard)
Bob - (3) Mesh----------------------------------(4) regrid

[anntsay]

this ticket is part of the NASA MAP proposal milestone. some users are asking about this.

[anntsay]

Core team: break this into smaller tickets so it can be completed through several versions. This feature is funded.

@oehmke and @anntsay to discuss offline what part can be broken off to finish in 8.10 and create corresponding ticket.

[anntsay]

this is the parent ticket. need to review with Bob to see if there are child tickets of this in 9.0.0.