Unification of INCLUDE files

[hnqtran]

Currently a same constant is defined across multiple INCLUDE files under src/inc. For example, all constants defined in src/inc/IOCNST3.EXT are also defined in src/inc/EMCNST3.EXT (which contains a much larger set of constant).

This practice makes it difficult to keep track when a constant need to be updated or added. Furthermore and for example, including both IOCNST3.EXT and IOSTRG3.EXTcould be replaced by just including EMCNST3.EXT.

[cjcoats]

Almost all of this goes away if you follow the practice of USE M3UTILIO as has been reccommended since the creation of I/O API version 3.0 in 2003.

[cjcoats]

See https://github.com/cjcoats/SMOKE-m3utilio