* gegl/operation/Makefile.am: install operation header files in
$(includedir)-0.0/operation/
* gegl/gegl-module.h: do not include gegl-types.h
* gegl/gegl-types.h: added some ad-hoc guards against multiple
typedefs.
* gegl/graph/gegl-node-context.c:
* gegl/graph/gegl-node.c:
* gegl/operation/gegl-operation-area-filter.c:
* gegl/operation/gegl-operation-composer.c:
* gegl/operation/gegl-operation-filter.c:
* gegl/operation/gegl-operation-meta.c:
* gegl/operation/gegl-operation-point-composer.c:
* gegl/operation/gegl-operation-point-filter.c:
* gegl/operation/gegl-operation-sink.c:
* gegl/operation/gegl-operation-source.c:
* gegl/operation/gegl-operation.c:
* gegl/operation/gegl-operation.h:
* operations/affine/module.c:
* operations/color/remap.c:
* operations/core/clone.c:
* operations/core/crop.c:
* operations/core/nop.c:
* operations/core/shift.c: modified to compile with header files
modified to allow the operation headers being installed.

svn path=/trunk/; revision=1870