[QGIS-Developer] macOS QGIS 3 installer update

[William Kyngesburye]

OK, a compromise: I simplified the installer.

- python still uses an external download and install.

- QGIS and GDAL combined into one installer.  But, GDAL is still installed globally, not bundled in QGIS.

If you downloaded it today but it didn't work, try again, I fixed a problem just now.

-----
William Kyngesburye <kyngchaos*at*kyngchaos*dot*com>
http://www.kyngchaos.com/

"Time is an illusion - lunchtime doubly so."

- Ford Prefect