osgearth script improvements

[hamish]

Hi,

while testing the packages I've come up with a few comments/improvements which would be nice for the Osgearth installer script:

• mention in the quickstart that it might not like running in VMs (OpenGL req'd)
• and that a network connection is needed for WMS and OSM overlays to work

• add a desktop link to the simple Blue Marble example, then it can be in the menu and get a bit more exposure.

thanks, Hamish

[hamish]

see also ML rehash during 4.5rc testing, March 2011.

[hamish]

OpenGL issue seems to have gone away in modern VMs, other noted issues still remain, especially lack of a menu entry/desktop icon file, which would be easy to do.

Hamish

[darkblueb]

specifically for VirtualBox, the user must take a second step after running, and install the VBox additions pack. Once the additions are installed, OpenGL is typically available. This should be explicit somehow.