Possibly-missing error handling

[maresb]

This is unlikely to cause an actual issue in practice, but I noticed that here we set IFL from the result of the environmental CAPE, but shortly thereafter we reassign it to the nominal value of 1 without actually handling the case where it's not 1.

I say this is unlikely to cause an actual issue because this is just one of many CAPE computations, so the probability of a failure here but not elsewhere is not particularly high.

In my browser, I have to scroll down to see the reassignment IFL=int(1):

tcpyPI/src/tcpyPI/pi.py

Lines 585 to 598 in 3c1d4ef

	# if the CAPE function tripped a flag, set the output IFL to it
	if (IFLAG != 1):
	IFL=int(IFLAG)
	#
	# *** Begin iteration to find mimimum pressure ***
	#
	# set loop counter and initial condition
	NP=0 # loop counter
	PM=970.0
	PMOLD=PM # initial condition from minimum pressure
	PNEW=0.0 # initial condition from minimum pressure
	IFL=int(1) # Default flag for CAPE calculation

[maresb]

On a related note, in the loop to compute $p_\min$ it looks like we use the IFLAG of the last iteration. Maybe we could bail earlier on an error?