Add calculation for accumulated physics tendencies for theta, qv, u and v

[weiwangncar]

TYPE: enhancement

KEYWORDS: accumulated physics tendencies, diagnostics only

SOURCE: internal

DESCRIPTION OF CHANGES:
Problem:
WRF model can output physics tendencies at any output times, but they are instantaneous values.

Solution:
Add calculation to accumulate physics tendencies in any history output window for theta, qv, u and v fields. In all, 16
new arrays are added for cumulus, microphysics, shallow cumulus, PBL and radiation. The calculation can be turned
on by namelist switch acc_phy_tend = 1 in &physics.

LIST OF MODIFIED FILES:
M Registry/Registry.EM_COMMON
M phys/module_diagnostics_driver.F
M phys/module_diag_misc.F

TESTS CONDUCTED:

1. Tests are conducted, and accumulated tendency output is checked.
2. Jenkins tests are all passing.

RELEASE NOTE: Sixteen accumulated physics tendencies fields for potential temperature, water vapor mixing ratio, u and v components of the wind are added, and it can be turned on by namelist option acc_phy_tend = 1 in &physics.

[weiwangncar]

Jenkins tests are all passing:
Test Type | Expected | Received | Failed
= = = = = = = = = = = = = = = = = = = = = = = = = = = =
Number of Tests : 19 17
Number of Builds : 48 45
Number of Simulations : 160 155 0
Number of Comparisons : 101 100 0

Failed Simulations are: 
None
Which comparisons are not bit-for-bit: 
None

[dudhia]

deleted and replaced

[davegill]

@weiwangncar
A couple of review requests to consider in this accumulated tendency PR:

1. a debug level for the print that says "resetting back to zero"
2. make the option MAX_DOMAIN, maybe only need the tendencies on a particular domain

[weiwangncar]

Test Type              | Expected  | Received |  Failed
= = = = = = = = = = = = = = = = = = = = = = = =  = = = =
Number of Tests        : 23           24
Number of Builds       : 60           58
Number of Simulations  : 159           155        0
Number of Comparisons  : 96           93        0

Failed Simulations are: 
None
Which comparisons are not bit-for-bit: 
None