tell Soar to chunk particular variables as constants

[garfieldnate]

Add new production syntax to indicate to the chunker that particular variables should be chunked as constants.

• need to discuss syntax, but here's my first suggestion: <var-name :const>
• will apply to the variable if used in any of its occurrences in a production
• Would also be convenient to have production-level syntax to indicate that all variables should be consts. My suggested syntax would be a flag like :o-support, but with a different string such as :chunk-consts.

The exact syntax, and perhaps some functionality (after I do an initial investigation), need to be further discussed in the group.

The current workarounds are quite terrible. One that James has used: put data in smem, retrieve it back from smem, and chunk the result (since chunking doesn't work through smem).