GL: add getWidgetHandle
GL: add tests of used extensions
ctools: add min/max in C
ctools: fix build
setup.py: add ctools/minMax
ctools: update generated C code
GL: typo clic->click
GL backend: send right clic event when zoom stack is empty
Merge remote-tracking branch 'upstream/master'
ctools: fix minMax
ctools: update generated C code
GL: use ctools.minMax for curves and images
GL: move plot image colormap + RGBA to a GLSupport
GL: Fix cursor change for selectable items
GL: remove useless x|yStep
curve picking updated
fix imageClicked
GL:use curve object directly
Display plot frame even if empty
bbox and pick curve optimisation