DA gen_be_v3 updates for cv_options=5 etc

[jamiebresch]

TYPE: enhancement

KEYWORDS: WRFDA, gen_be_v3, cv_options=5

SOURCE: Jamie Bresch (NCAR)

DESCRIPTION OF CHANGES:
A collection of fixes and enhancements for gen_be_v3

1. add multi-variate statistics capability for stream function, velocity potential, temperature and surface pressure
2. bug fix for be_method=ENS with multiple valid dates
3. add time_lag_ens option for calculating statistics from time lagged ensembles
4. add a sample makefile that uses WRFDA-compiled lapack-lib.

LIST OF MODIFIED FILES:
M var/gen_be_v3/README.gen_be_v3
D var/gen_be_v3/compile_casper
D var/gen_be_v3/compile_cheyenne
M var/gen_be_v3/gen_be_v3.F90
A var/gen_be_v3/makefile
A var/gen_be_v3/util/combine_be_cv5.f90
A var/gen_be_v3/util/makefile

TESTS CONDUCTED:

1. The updated code has been used by Taiwan's Central Weather Bureau and NCAR's Antarctic Mesoscale Prediction System.
2. Jenkins tests all passed.

RELEASE NOTE: WRFDA gen_be_v3 is updated for cv_options=5 and ensemble applications. Please see var/gen_be_v3/README.gen_be_v3.

[jamiebresch]

Please find result of the WRF regression test cases in the attachment. This build is for Commit ID: 755c227, requested by: jamiebresch for PR: #1276. For any query please send e-mail to David Gill.

Test Type              | Expected  | Received |  Failed
= = = = = = = = = = = = = = = = = = = = = = = =  = = = =
Number of Tests        : 19           18
Number of Builds       : 48           46
Number of Simulations  : 166           164        0
Number of Comparisons  : 105           104        0

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

[liujake]

You can merge if ready.

[liujake]

@davegill Permission is changed for merge? I see 'Merge is blocked' for me.