Ubuntu Quickly is no longer being maintained and has been replaced by the Ubuntu SDK (and Make). The last commit was in 2012. If you stumble across the documentation [1] you might believe this is the way to make Ubuntu apps easily. It also defaults to technologies we no longer recommend python2 and gtk2*.
I did email the desktop team and got confirmations it's no longer needed [2]. Let's remove both source and binaries from 15.10 if possible.
Source Packages to remove: quickly, quickly-widgets, quickly-unity-lens-template, unity-singlet
Binary package list - python-quickly-common python-quickly-core python-quickly.widgets python-unity-singlet quickly
quickly-ubuntu-template quickly-unity-lens-template quickly-widgets quickly-ubuntu-template
Pandora-build is no longer needed and can be removed, but it might be trickier because an older version is Debian.
[1] https://wiki.ubuntu.com/Quickly
[2] https://lists.ubuntu.com/archives/ubuntu-desktop/2015-September/004727.html
* In fact it might be the key blocker for a few old glade gtk2 packages in repo.
Talked to the Pandora-build developer who says it is abandoned (and has been for 5 years). An older version is still in Debian - not sure the best way forward for that.