history tabs & show all history window should open in new tabs

[cairnsturnbull]

I think it would be an improvement to the overall experience if tabs selected from the history drop-down menu opened in a new tab rather than changing the current open tab to the selected history.

Most of the time I simply have to open a new tab with a random (usually mix of keyboard letters) prompt just in order for me to reopen an old tab without replacing the previous tab which I also still want to keep.

I also don't see the reason why the "show all history" drop-down menu item should open in a new window since selecting any historical tab reopens it in the main window anyway. Seems like more complexity than needed. I think this should also simply be a new tab instead on the main window, allowing the user to much better track what old tabs have just been reopened adjacent to the all history tab.