Fixed some problems with the Makefiles that prevented building on Linux
Added a Makefile.am to build tools/gen_code
Added new function ta_BETA
Added new target ta_abstract_gc which is linked in by gen_code instead of regular ta_abstract
Updated ta_BETA to use a sliding window
Fixed some problems with the Makefiles that prevented building on Linux
Added a Makefile.am to build tools/gen_code
Added new function ta_BETA