• removed needless "my $c = ...;" statements in binf() and bnan()
  
• forgot () around "$x->{_f} & MB_NEVER_ROUND"
  
• bsqrt(inf) == inf, not NaN
  
• $x->bdiv($x) did not round the resulting 1 properly
  
• removed the shortcut testcode in bdiv() (Calc handles this now)
  
• added (non-working for now) broot() method
  
• changed length() to CORE::length() in two places (thanx Liz!)
  
• config() can take arguments and set them, croak on wrong ones
  
• config(trap_nan => 1) to manipulate former $NaNOK variable
  
• config(trap_inf => 1), too
  
• trap_nan/trap_inf really croak on any attempt to create an NaN/inf
  
• spellings of Bigint => BigInt
  
• _find_rounding_parameters(): set $a to undef if it is 0