Check for 0s or (0/1s) in BEAUti GLM import

[msuchard]

• Turn off log if matrix contains a 0
• Turn off standardize if matrix only contains 0/1

[plemey]

• provide an option to add a pseudo-count if matrix contains a 0?

[plemey]

• do not allow to unselect 'origin' and 'destination' for state-specific predictors. (Even if you do now, they will still be outputted as 'origin' and 'destination' predictors)

[rambaut]

Added checks for zero values/logging and binary/standardization in the generator check. Will add UI constraints later.