check if `calc_length_ccf_v_grid` is doing what is intended (see Issue #52)

[hematthi]

EchelleCCFs.jl/src/ccf/plan.jl

Lines 51 to 57 in a639217

	""" `calc_length_ccf_v_grid( plan )`
	Return number of points in the velocity grid (without needing to create the range).
	"""
	function calc_length_ccf_v_grid(p::PlanT where PlanT<:BasicCCFPlan )
	n = ceil(Int, p.v_max/p.v_step)
	length=2*n+1
	end

[hematthi]

See #52

[eford]

Fixed with #52