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Summary of changes in this fork

Changes in nlaws-wip branch

parse TRANSFORMER SETTING taps correctly
regulator nominal voltages were not scaled correctly
was setting all SOURCE EQUIVALENT nodes to the source bus (in other words was only handling a single feeder)
- can now handle a substation with feeder(s) [needs validation with multiple feeders]
handle sections with single phase regulators correctly
- for example, for the IEEE13 system the Cyme reader was chaining single phase regulators together that should be in parallel between nodes
set single phase transformer nominal voltage to LN (was LL)

improved logging, debug messages, doc strings, comments
handle load power factor <= 0
add parser for TRANSFORMER BYPHASE SETTING
add Winding.base_voltage field to distinguish the basis for per-unit calculations from actual voltage settings on transformers
use @staticmethods for static methods

PV kvarlimit -> kvarmax (name change in openDSS)
replace all special characters with underscore in object names written to .dss files (openDSS does not allow special characters in object names)
add PowerSource nominal voltage to Voltagebases
fix the nominal voltage for single phase voltage regulators (was LL, now LN)
fix the order of parameter settings for many objects (prevent segmentation faults in openDSS)
fix capcontrol definitions (was not accounting for the minimum required values and was using some values incorrectly)

improved logging, debug messages, doc strings, comments
add Winding.base_voltage to list of Voltagebases
implement unbalanced loads
- was summing all phase loads and only modeling balanced loads
close the Lines.dss file after writing

system_structure_modifier now uses set_nominal_voltages_recur as recommended in the comments
- remove broken, unused set_nominal_voltages method
- add warning when changing node nominal_voltage
add pandas to install_requires (fixing bug when trying to run some functions with pip install all)