New smoothing kernels for dgrid3d.
New smoothing algorithm for plot: 'smooth cumulative'
Updated documentation for dgrid3d.
Fixing two compiler warnings related to dgrid3d.
Demos for dgrid3d and smooth freq and smooth cumul.
Added log entry for new demos (dgrid3d and smooth cumul demos).
Changes for new smoothing algorithm for smooth histograms using Gaussian kernel density estimates.
Follow code conventions for new code on smooth kdensity.
Fixing a badly formatted comment.
Fixing minor defect in interpol.c (eval_kdensity). Adding new smoothing algos to New Features sections in gnuplot.doc and gnuplot.texi.
Fixing some whitespace.
Adding support for the Airy function.
Fixing the static function declarations for the Airy function.
Added support for wildcard matches in the undefine command.
Fixing a typo in INSTALL