create UbuntuGIS package for current stable libLAS

[kalxas]

This will speed up Live builds

[kalxas]

Thanks Jerome for providing the packages: ​https://launchpad.net/~ubuntugis/+archive/ubuntugis-unstable/+sourcepub/3394820/+listing-archive-extra

We need to update install_liblas.sh to point at this

[jlarouche]

I've been told it needs the python-binding. I'll need to work a bit more on the package to add those.

[jlarouche]

I just uploaded the python-liblas who should provide the python bindings.

[kalxas]

Thanks jlarouse. I think it is time to add this to the install script

[kalxas]

(In [10605]) switched libLAS installation to new UbuntuGIS package (refs#1181)