debian packaging: add saucy and jessie support
also add note about tests and result uploads to INSTALL.t2t
apply #8601
revert change of doxygen DOT_GRAPH_MAX_NODES
fix gui bindings with SIP 4.15
osgeo4w: more 'improvements'
 * package(64).cmd:
  * remove apps/%PACKAGENAME% before install (ie. don't repackage old cruft)
  * context_help, function_help, qgis_help.db, delimitedtextplugin.dll and diagramoverlay.dll removed in 2.0
 * package64.cmd: cmake is in PROGRAMFILES(X86)
 * nsis: installer don't use 64bit settings when installing 32bit package on 64bit OS
some more syncs with release-2_0
Add extra CXXFLAGS flags set by user; can be -D CXX_EXTRA_FLAGS or environment variable

- Command line -D option overrides environment variable
- Useful for suppressing transient upstream warnings in dependencies, like Qt
Add support for PYTHONSTARTUP-like environment variable, PYQGIS_STARTUP

- Different than user's 'startup.py,' since it is loaded just after Py_Initialize, specifically from env variable
- Useful for cleaning sys.path, e.g. isolating/loading the initial environ without requiring a virt env, like homebrew or MacPorts installs on Mac
Add unit test for PYQGIS_STARTUP environment variable

- Make PyQgsAppStartup test more general and PEP8 compliant