Clean up nm to m conversion in GOCART2G

[mathomp4]

wavelengths_diagmie is still declared as integer:

GOCART/ESMF/GOCART2G_GridComp/GOCART2G_GridCompMod.F90

Line 113 in 58af774

integer, allocatable, dimension(:) :: wavelengths_diagmie

which is inconsistent with self%wavelengths_profile and self%wavelengths_vertint (real).

I would still recommend including changes from PR #65 into this branch to address this issue and streamline the code. For example, conversion from nm to m should be done only once (see https://github.com/GEOS-ESM/GOCART/pull/65/files#diff-682724d291af0ad213c4e1b2ffa97156de4989543290b60bf362adfa98e3d8da):

GOCART/ESMF/GOCART2G_GridComp/GOCART2G_GridCompMod.F90

Lines 156 to 162 in b9fa4c6

	! Convert input wavelengths from nm to m for internal use
	self%wavelengths_profile = 1.e-09 * self%wavelengths_profile
	self%wavelengths_vertint = 1.e-09 * self%wavelengths_vertint
	wavelengths_diagmie = 1.e-09 * wavelengths_diagmie
	! Set wavelengths in universal config

Originally posted by @rmontuoro in #68 (comment)

[amdasilva]

This is less of an issue now since these calculations are now done at array level with the refactoring of the Mie calculations.