Vague instructions for converting the IEEE-13 example

[trevorhardy]

Describe the bug
The step-by-step instructions on running the conversion of the IEEE-13 node example are vague with regards to success and errors

To Reproduce
Run the conversion of the IEEE-13 example as stated in the instructions

Expected behavior
Clear indication that the conversion was successful. I think the conversion was successful but the last output to terminal is:

Last Error: Cannot create /root/Documents/OpenDSSCmd/ directory.

Additionally, the instructions state "tail sum*.csv to verify that the converted OpenDSS files ran correctly" with no guidance on how to evaluate the success of the conversion. The word "SOLVED" does appear in the tail output; is that good enough.

[temcdrm]

There are some cryptic headers in the csv file outputs about the min/max voltage over all nodes, total MW, and total MVAR. Based on familiarity with that test system, one should expect 0.95 - 1.05 pu voltage, but this test case deviates from that. The source injection is about 3.5 + j2 MVA, but again there are some difference between the two variants. There are some round-trip comparisons in other example directories.