* gegl/gegl-plugin.h: incremented ABI version.
* gegl/operation/gegl-operation-point-filter.[ch]: added roi as an
argument for the point filter process() function.
Modified the process() vfuncs for the following operations accordingly:
* operations/common/brightness-contrast.c: 
* operations/common/color-temperature.c: 
* operations/common/contrast-curve.c: 
* operations/common/grey.c: 
* operations/common/invert.c: 
* operations/common/levels.c: 
* operations/common/svg-huerotate.c: 
* operations/common/svg-luminancetoalpha.c: 
* operations/common/svg-matrix.c: 
* operations/common/svg-saturate.c: 
* operations/common/value-invert.c: 
* operations/common/whitebalance.c: 
* operations/core/convert-format.c: 

svn path=/trunk/; revision=2363