Lua: add Variable:totab()

In favor of establishing symmetry with :fromtab
lua: add rtt_rospack based find_rospack
add basic rttlib.help
optimize rtt_rospack_find + fix to work with services
deployer: adding check-only feature for deployer

Also added checking peer connections, activity setting and
improved log messages.

Signed-off-by: Peter Soetens <peter@thesourceworks.com>
Merge branch 'master' of git://gitorious.org/orocos-toolchain/ocl-mk into toolchain-2.7
Merge branch 'master' into toolchain-2.7