Fixed ddgdir creation. Additionally, possible fix for R_HISTSIZE
Fixed snapshot issue with capturing graphic devices:
;
Bug fixes for enhancements
Removed repeated item
Writing out as object and text string
bug fixes
Removed check for length of object when taking snapshot:
Detecting graphic device classes and saving appropriately
fixed merge conflict with master
Simplified .is.graphic
Added commentary
Implemented .grabhistory function and added to NAMESPACE
Merge branch 'master' into features