Turn off unused MEKE ALPHA coeffs

[alperaltuntas]

needed for beta05. Assignee: @iangrooms

[iangrooms]

Since we're using the GEOMETRIC scheme for the GM & Redi coefficients, we do not need to compute several MEKE_ALPHA parameters that are used by the mixing-length version. These settings should turn off unused parameters without changing anything about what we're actually using:

MEKE_ALPHA_DEFORM = 0.0  
MEKE_ALPHA_RHINES = 0.0
MEKE_ALPHA_EADY = 1.0
MEKE_ALPHA_FRICT = 0.0
MEKE_ALPHA_GRID = 0.0

(Note that we are using MEKE_ALPHA_EADY and it is already correctly set to 1, but I included it here for completeness.)
@MFJansen pointed out to me that we had turned on the computation of several unused length scales. He also suggested that we set

MEKE_CT = 0

since it's unused in our current configuration.