libspimage updated

I've uploaded a new version of libspimage after Chris Roome brought to my attention that it was impossible to compile the new hawk release with the old libspimage (thanks for the tip).

No radical changes, just a better code organization and some new data structures.

I've dropped the statically compiled libraries as they are now included in the binary packages of hawk.

Here's the direct download link http://xray.bmc.uu.se/~filipe/files/hawk/libspimage/releases/libspimage-...