qgis-20: nix symlink of dev frameworks to HOMEBREW_PREFIX/Frameworks

- Note: this messes with isolation and when building from source outside of Homebrew
scripts: rename qgis app env vars script
scripts: add qgis creator build/install scripts
scripts: update qgis cmake option script to work with new creator build/install scripts
diffs: remove all diffs until osgeo4mac-update tool is ready
scripts: qgis-cmake-options.py; add argparser
scripts: qgis-set-app-env.py; remove hardcoded paths; auto-create log file
scripts: qgis-creator-build/install.sh; fix renamed env script path
qwtpolar: update to match PR
scripts: qgis-cmake-options, qwt/qwtpolar only frameworks now in homebrew
qgis-20: update python configuration; add qwtpolar framework support
qgis-20: small brew audit fix
scripts: qgis-creator-build, skip staging plugins to build dir by default
python-test: boneyard-only test for homebrew’s python setup
scripts: qgis-cmake-options, better find of qwt/qwtpolar frameworks; be specific on python2.7 framework
spatialite-gui-17: override formula to keep it working with wxmac-294
Fix #13 (adding bookmarks causes QGIS crash): add library path to Qt Plugins
qgis-20: backport PYQGIS_STARTUP support for isolation

- Also avoids Kyngchaos.com python modules from pulling in duplicate linked *.framework libs
grass: (unfinished) attempt to get gui working with older wxmac (needs 2.8.x, not 2.9x?)
wxmac-28: (2.8.12.1, untested) added for grass 6.4 compatibility