- now AVX has the priority over SSE2/SSE3 in the hopping operator code
	- to enable AVX code is sufficient to pass -DAVX in the cflags
	- i've avoided to modify directly the autoconf, so in order to compile with tsplitpar you need
	  *both* sse and (eventually) AVX.
	- fixed some missing symbols in hopping_body_dbl.c. mostly an hack, but it works.