Fix blobbogram autoscaling bug

 - make sure that extreme ranges do not crash the plot (the scale will be ugly, though)
Slightly nicer plot.new/grid.newpage behaviour
Bump version
Prevent warnings about sd(matrix) deprecation
Fix ask-for-next-plot behaviour
Indentation
Better default scales for blobbogram
Fix ANOHE bug
Update NEWS
Add Matrix to imports since igraph now suggests it

 - Per request of Prof. Brian Ripley
Fix nodesplit summary plot comparison labels

 - They were reversed compared to the ANOHE and relative.effect forest plots
Update NEWS
Add regression test
Add check-as-cran target to Makefile
Fix overfull hbox
Fix BUGSTMP
Update NEWS/DESCRIPTION for 0.5-1
Eliminate use of Matrix (hopefully)
Fix use of C99 "inline"
Release 0.5-2 DESCRIPTION / NEWS