StokesPolarization can't be initialized floating point numbers

[israelmcmc]

While LinearPolarization can be initialized with floats, StokesPolarization forces you to use a function:

from astromodels import Constant, StokesPolarization, LinearPolarization

# This fails (TypeError: 0.5 is not of type Node)
# StokesPolarization(Q = .5, U = .5)

# This works
qpar = Constant()
qpar.k = .5

upar = Constant()
upar.k = .5

StokesPolarization(Q = qpar, U = upar)

# This works!
LinearPolarization(degree = .5, angle = 10)

# Also works
pd = Constant()
pd.k = .5

pa = Constant()
pa.k = 10

LinearPolarization(degree = pd, angle = pa)

For convenience, I think StokesPolarization should also have a condition to handle a single floating point number, like here:

astromodels/astromodels/core/polarization.py

Lines 93 to 110 in 5a10f08

	if callable(degree):
	self.degree = LinearParameter("degree", degree)
	else:
	self.degree = self._get_parameter_from_input(
	degree,
	0,
	100,
	"degree",
	"Polarization degree",
	"dimensionless_unscaled",
	)
	if callable(angle):
	self.angle = LinearParameter("angle", angle)
	else:
	self.angle = self._get_parameter_from_input(
	angle, 0, 180, "angle", "Polarization angle", "deg"
	)