Improved error messages for ./configure error checks. These error
messages also included in the error message from libbi when ./configure
fails, no need to check the configure.log file. Added tests to the Perl
module to check pure Perl parts, code generation, building and running
with various configs (CPU, CPU with SSE, GPU with CUDA).
Fixed incompatible sizes errors when multidimensional variable appears
on the left of an action with a scalar expression.
Emptied bugs.hpp file: all obsolete.
Updated MANIFEST.