Call find_package(OCE) to find OCE paths
Also call find_package(OCE) in GEOM and SMESH CMakeLists.txt
By default, only wrap modules which have been compiled by OCE

OCE 0.12 exports the new OCE_ALL_BUILT_MODULES variable for this purpose.
Merge pull request #110 from dbarbier/db/cmake-oce-paths

Improve OCE support in CMake