migration to Toolchain 2.8.x

Hi,

We've collected some tips and tricks when migrating to Toolchain 2.8.x
and put them here:
http://www.orocos.org/wiki/upgrading-toolchain-2x-toolchain-28x

Feel free to add/correct!

Sergio and Nick

PS: Maybe it could be of interest to add some of these things to the
readme on github?