Update Ark documentation to 16.08
man page
proofread, bump date + releaseinfo, add "See Also" with info about more qt + kf5 options
handbook
proofread, bump date + releaseinfo add features integrity test, compression and multi-volume update / add screenshot
content + pngs from https://rthomsen6.wordpress.com/2016/08/01/ark-improvements-in-16-08/
REVIEW:128645
