cmake: Add qt4 resources. Enable qt4 plugin compilation with cmake's CVS. (known not to work with cmake version 2.4-patch 7
)

cmake: Removed VERBATIM flag, allows OS to perform command substitution -- resolved unexpected directory creations.

This seems to fix the deadlock on Linux.

Define DATA_PATH in the root CMakeList.txt since modules might need it (for example the http intf or the lua module)

cmake: Use CPack to create the package. (Use `make package` or `cpack`). Should produce a tgz/tar.gz/rpm/dmg/nsis. This probably need some tuning.

cmake: Enable testing. (Launch with `make test` or with `ctest` (see ctest --help)). Plus minor cleanup.

cmake: prefer the use of target_link_libraries() over set_target_properties(LINKFLAGS), make sure we don't use "-z defs --as-needed" on Mac OS X.