fix: use %g - and fix corresponding output logs

Thanks-to: Barry Smith <bsmith@mcs.anl.gov>

Merge remote-tracking branch 'origin/knepley/feature-convergence-estimator'

* origin/knepley/feature-convergence-estimator:
ConvEst: Restore the SNES to the original condition after estimation
C

Merge remote-tracking branch 'origin/knepley/feature-convergence-estimator'

* origin/knepley/feature-convergence-estimator:
ConvEst: Restore the SNES to the original condition after estimation
ConvEst: Discretization can change, so move name extraction into loop
SNES ex13: Fixed test dependencies
SNES ex13: Update to new API
ConvEst: Initialize variables
Fortran: Fixed Fortran bindings - Need custom binding for all View() to handle default viewers
ConvEst: I hate Fortran
ConvEst: Damn damn damn
ConvEst: Added Fortran type
ConvEst: Fixed spelling, fixed type
ConvEst: Fixing LAPACK type
SNES ex13: Now estimate convergence using built-in test
SNES: Allow convergence estimation using -snes_convergence_estimate
PetscConvEst: Added an object which estimates the convergence rate of a discretization
PetscDT: Turn on Fortran binding
SNES ex13: Added test output
SNES ex13: Looking at automatic convergence estimation
PetscDS: Added exact solution functions - We will use these to evaluate convergence using MMS

Conflicts:
include/petsc/private/petscdsimpl.h
src/dm/dt/interface/dtds.c

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ConvEst: Restore the SNES to the original condition after estimation

ConvEst: Discretization can change, so move name extraction into loop

ConvEst: Initialize variables

ConvEst: Fixed spelling, fixed type

ConvEst: Fixing LAPACK type

PetscConvEst: Added an object which estimates the convergence rate of a discretization