Signal: use 64bit Link.
Signal: use 64bit Link.

A hack that makes us all safer.
TypeSystem uses a Link typedef that needs to be 64bits.
So if you use Signal::Link instead of Type::Link, you end up truncating
the signal id, which fubars everything.

Change-Id: I6d4d65d0e344cac53428339541f09b2d1df38856
Reviewed-on: http://gerrit.aldebaran.lan:8080/14927
Reviewed-by: cgestes <ddb78fe00abb42f91254c16a0860e38eb0781789@aldebaran-robotics.com>
Reviewed-by: mnottale <e3ccf1b6558404e921a21fa09cebb1153b50ec36@aldebaran-robotics.com>
Tested-by: mnottale <e3ccf1b6558404e921a21fa09cebb1153b50ec36@aldebaran-robotics.com>

vbarbaresi/libqi,aldebaran/libqi,aldebaran/libqi,bsautron/libqi,aldebaran/libqi