- Extended Number `sqrt_cfrac(n)` to accept an optional argument, specifying the maximum number of terms in the period of continued fraction expansion of sqrt(n).
- Extended Number `sqrt_cfrac(n)` to accept an optional argument, specifying the maximum number of terms in the period of continued fraction expansion of sqrt(n).

Example:
	say 12345678910.sqrt_cfrac(10)	#=> [111111, 9, 26, 1, 2, 3, 1, 1, 2, 8, 1]

trizen/sidef,trizen/sidef,trizen/sidef,trizen/sidef