Merge branch '21-int-overflow' into 23-objects
Merge branch '21-misc-cleanup' into 23-objects
Merge branch '21-misc-cleanup' into 23-objects
Merge branch '21-misc-cleanup' into 23-objects
Merge branch '21-misc-cleanup' into 23-objects
fix protection bug, define R_previousSymbol
bug fix, more tweaking
Merge branch '23-objects' into 24-new-news
news on fixing assignment form of substr bug