add cmake export to all targets & bugfix Find module

- Add "EXPORT paradiseo-targets" to cmake's "install" commands.
- Export those targets in "paradiseo-config.cmake",
  which is needed by FindParadiseo.cmake script.
- Bugfix "FindParadiseo.cmake" script:
    - document PARADISEO_ROOT input,
    - add PARADISEO_DIR to specify a bin dir (try build, debug and release as defaults),
    - bugfix bad copy pastes involving edo and peo,
    - default messages only for eo, mo and meo.

CMakeLists.txt

@@ -137,3 +137,12 @@ endif()
 if("${CMAKE_BUILD_TYPE}" STREQUAL "Release")
     include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/Package.cmake)
 endif()
+
+
+# Add all targets to the build-tree export set
+export(TARGETS eo FILE "${PROJECT_BINARY_DIR}/paradiseo-config.cmake")
+
+# Export the package for use from the build-tree
+# (this registers the build-tree with a global CMake-registry)
+export(PACKAGE paradiseo)
+