Update math/R-cran-car to 2.0-22.

Changes to Version 2.0-22
 * corrected bug in 'terms' argument in residualPlots, and other graphic
   functions with a 'terms' argument
 * added residual curvature tests for glm.nb
 * mcPlot and mcPlot draw 'marginal/conditional' plots for lm objects.  The
   marginal plot is of the centered response versus a centered regressor; the
   conditional plot is the corresponding added-variable plot.  The plots can be
   overlaid or viewed side-by-side.
 * added argument marginal.scale to avPlots to scale the added-variable plot for
   Y on X|Z using the scale from the marginal plot of Y vs X ignoring X.  The
   default is FALSE, corresponding to using scaling to maximize resolution or
   use xlim and ylim to set user scaling.
 * Fixed bugs in Anova.survreg() that could affect types II, II tests, both Wald
    and LR, and one similar bug in linearHypothesis.survreg().
 * Replaced calls to require() with requireNamespace() where possible
   (suggestion of Brian Ripley).
 * The following functions now produce warnings rather than errors when there
   are empty groups: scatterplot(), scatterplotMatrix(),scatter3d(),
   densityPlot().
 * Corrected name of "Blackmoor" dataset to "Blackmore".
 * Added KosteckiDillon migraines dataset (contributed by Georges Monette).
 * introduced linearHypothesis.rlm() for rlm models (suggestion of Matthieu
   Stigler).
 * Small bug fixes/improvements.

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