aCont: Continuous Life Annuities
In JoaquinAuza/DetLifeInsurance: Life Insurance Premium and Reserves Valuation

Calculates the present value of a continuous life annuity.

1	aCont(x, h, n, i = 0.04, data, prop = 1, assumption = "constant", cap = 1)

`x`	An integer. The age of the insuree.
`h`	An integer. The deferral period.
`n`	An integer. Number of years of coverage.
`i`	The interest rate. A numeric type value.
`data`	A data.frame of the mortality table, with the first column being the age and the second one the probability of death.
`prop`	A numeric value. It represents the proportion of the mortality table being used (between 0 and 1).
`assumption`	A character string. The assumption used for fractional ages ("UDD" for uniform distribution of deaths and "constant" for constant force of mortality).
`cap`	A numeric type value. The value of the payment.