Expand get_data to allow the type of data to be returned

[samaloney]

Don't really like the type or even dtype as they are have other meanings/uses but can't think of an alternative right now maybe vtype for value type

• c = count
• cr = count rate
• dc = differential count
• dcr = differential count rate
• dcrf = differential count rate flux

So modify last few line and above as necessary to divid by the appropriate normalisations give the type

stixpy/stixpy/product/sources/science.py

Lines 1006 to 1010 in fb3004c

	counts_err = np.sqrt(counts * u.ct + counts_var) / (e_norm * t_norm)
	counts = counts / (e_norm * t_norm)
	return counts, counts_err, times, t_norm, energies