Add a section to mapnav for user to navigate between previous and next extent

[mweech]

@jolevesq commented on Mon Mar 20 2017

Add to map nav section a tool for use to navigate between previous and next extent

---

@mweech commented on Mon Mar 27 2017

This one was left out of the original UI design on purpose if I understand correctly. Need to assess how necessary this is from a business perspective. Although we are replacing existing viewers we need to be careful not to just try to replace functionality 1:1.

Also blocked by full state capture refactoring.

---

@jolevesq commented on Thu Mar 30 2017

I know this function is use by internal people in NRCan who work with GCViz viewer. They found this useful when they need to move back and forth on the same extents for their work. For external user I don't know how much this tool is used.

[mweech]

Transfer of fgpv-vpgf/fgpv-vpgf#1791