CSOLNP: Fix some problems revealed by Eigen conformability checking
Rework calculation of compiler args; add IMX_SAFE switch
Add test for omxGetParameters
Switch default optimizer back to CSOLNP
omxGetParameters: Omit duplicated parameters even when there are no submodels
Tidy up MxMatrix-related error and warning messages; re-write MatrixErrorDetection.R to be much more thorough.
BA81: Need to fail hard
BA81: Prohibit all NA rows
All NA rows screw up latent distribution estimates.
Small but important MxMatrix-related adjustments.
Add Jacobian-based model identification check.