Fix stochastic restart bit for bit trouble

[davegill]

TYPE: bug fix

KEYWORDS: stochastic, restart, b4b, hrrr_cycling

SOURCE: Judith Berner (NCAR), internal

DESCRIPTION OF CHANGES:

1. Made the random number seed to have a dimension that is intrinsic to the compiler.
2. Force hrrr_cycling = .true. to avoid resetting seeds on restart.
3. The seeds now have a "Z" stagger (no zero value in last entry).
4. Modify code to accommodate the swap from vertical dimension of seed to the new seed_dim

ISSUE: For use when this PR closes an issue. For issue number 123

Fixes #123

LIST OF MODIFIED FILES:
M Registry/registry.dimspec
M Registry/registry.stoch
M dyn_em/module_first_rk_step_part2.F
M dyn_em/module_stoch.F
M share/module_check_a_mundo.F

TESTS CONDUCTED:

1. The patterns are identical after a restart.
   :thumbs_up:

RELEASE NOTE: After hrrr_cycling was introduced to WRF, the stochastic solutions were not bit reproducible with a restart. Also, with newer compilers, the size of the seed array exceeded the vertical dimensions in WRF. Both have been addressed.