Add "number of instances" dimension to module-level variables to support multi-instance usage

[peverwhee]

Description

In order to enable multiple instances, we'll need a new dimension on all module-level (host caps and suite caps) variables. This includes: _dynamic_constituents (host cap), _constituents_obj? (host cap)

Solution

Add/update the following:

• New ccpp variables (standard names not set in stone): "number_of_ccpp_instances" (integer) and "ccpp_instance" (integer, index)
• Add an extra dimension to module variable declarations
• Update allocate statements (in the init phase) to allocate the new dimension to the # of instances

User Interface Changes

Optional - host can now supply instance number to the cap routines (if not supplied, defaults to 1)

[gold2718]

Note, there was some discussion of this in the PR to prebuild a while ago. See the comment about the proposed capgen implementation for a suggestion about CCPP standard names that could be used for this method.