5.7.9beta49

Mbm_grdplot, mbm_grd3dplot, mbm_histplot, mbm_plot, mbm_xyplot: Made evince one
of the default Postscript viewers because it is commonly installed on Ubuntu
machines.

General: Addressed compiler warnings due to uninitialized variables, inconsistent
variable typing, and other minor issues.

MBnavadjust: Changed the solution algorithm so that the final stage of LSQR
matrix inversion is done in several steps. As before, the first three stages are
to construct an initial model by interpolating any global ties, then solve for
and apply average offsets for each survey, then conduct an iterative relaxation
towards an additional perturbation solution. Each stage produces a perturbation
solution, that is, a solution to fit the navigation offsets remaining after
applying the existing navigation model. Each perturbation is added to the
navigation model, which is then the starting point for the next stage. These
three stages build up an approximate navigation solution that solves most of the
original mismatch between overlapping and crossing swathes. The final stage is
to build and solve an overdetermined least squares matrix problem constrained by
all crossing and global times, by any surveys with fixed navigation, and also
constrained by a penalty against first and second derivatives of the perturbation.
Now, for multi-survey projects the matrix solution stage consists of first
solving the full matrix problem, then solving for a perturbation to satisfy
the remaining misfit for each of the individual surveys in turn, and finally
redoing the full matrix problem. Again, after each solution step the resulting
perturbation is added to the navigation solution.

Mbnavadjust: Added two new list options for sorted crossing ties. Now the sorted
crossing tie list can be limited to the top 5% or 1% of ties.

Format MBF_MBARIROV (165): Added recognition for new filenaming conventions for
MBARI ROV navigation files.