Write Tecplot routines should only write real parts of the data

[anilyil]

Description

If a curve coef array is complex valued, the writeTecplot (e.g. https://github.com/mdolab/pyspline/blob/main/pyspline/pyCurve.py#L822-L846) method will write the data as is in complex form. I am not 100% sure if this is the case but at some point I may have run into this issue and I don't have time to check now. It's not a critical issue at all, so just leaving the issue here to keep track. Ultimately, we should only use the real parts of the data when writing to Tecplot here:

pyspline/pyspline/utils.py

Lines 30 to 53 in f4fbb14

	def writeTecplot1D(handle, name, data, solutionTime=None):
	"""A Generic function to write a 1D data zone to a tecplot file.
	Parameters
	----------
	handle : file handle
	Open file handle
	name : str
	Name of the zone to use
	data : array of size (N, ndim)
	1D array of data to write to file
	SolutionTime : float
	Solution time to write to the file. This could be a fictitious time to
	make visualization easier in tecplot.
	"""
	nx = data.shape[0]
	ndim = data.shape[1]
	handle.write('Zone T="%s" I=%d\n' % (name, nx))
	if solutionTime is not None:
	handle.write("SOLUTIONTIME=%f\n" % (solutionTime))
	handle.write("DATAPACKING=POINT\n")
	for i in range(nx):
	for idim in range(ndim):
	handle.write("%f " % (data[i, idim]))
	handle.write("\n")