OpenMx 1.0.7

This release contains the following changes from 1.0.6:

• error checking in front-end for non-positive-definite observed covariance matrices
• fixed a bug in MxMatrix indexing operator
• added deprecation warning for argument 'all'=TRUE in mxPath(). For more information on the deprecation see: https://openmx.ssri.psu.edu/wiki/deprecation-mxpathall-true-argument