XSB Src (SVN)-old

to take their arguments from specified registers (instead of always from
reg 1-n).

builtin.c (all ctop/ptoc reg_term for bi_instr)
context.h (for biargs on multithread)
dis.c (for bi_instr disassembly)
emudef.h (decl of biarg and bioldarg[])
emuloop.c (unikavars and bi_instr, and no deref)
gc_mark.h (added case for RRRR)
inst_xsb.h (added bi_instr and unikavars, and RRRR)
loader_xsb.c (sep fix for cygwin toupper)
ptoc_tag_xsb_i.h (builtin arg access)
std_pred_xsb_i.h (minor fix to avoid arity var confusion)
system_xsb.c (added windows get_tmp_filename def)
xsb_inst_list.h (2 new instrs)