Reparameterizing an inline C model fails

[tsole0]

**Partner issue in sasmodels: SasView/sasmodels#605

Describe the bug
Please see sasmodels issue linked above for description of the bug

To Reproduce (in SasView GUI)
Steps to reproduce the behavior:

1. Open a new .py model in your sasview user plugin directory (normally ...\UserDir\.sasview\plugin_models\)
2. Copy in the following code:

from numpy import inf

from sasmodels.core import reparameterize
from sasmodels.special import *

parameters = [
    # name, units, default, [min, max], type, description
	['new', '', 0, [-inf, inf], '', ''],
]

translation = """
    sld = new
"""

model_info = reparameterize('lamellar', parameters, translation, __file__)

3. Save file and select it in a NEW fit widow inside SasView
4. Load example data into the fit window
5. View error message in log explorer (... error: 'sld' undeclared)

Expected behavior
The model should have no issues being loaded or used with the new redefinitions.

Screenshots
The reparameterized model:

Behavior in SasView:

SasView version (please complete the following information):

• Version: 6.0.0b (developer ver)

Operating system (please complete the following information):

• OS: Windows 10

Suggested Solution:
Either deprecate using inline C code (only one model currently uses it and it is easily replaceable), or fix the reparameterization code in sasmodels.core to support inline C code.