Custom Electrode Update

Bug fix:
File name changes to allow for linux support (more info available HERE)
Fixes were made to allow for multiple different node sizes (more info available HERE)

New Features:
Custom electrode configuration ability (more info available HERE)
More data saving options (including internodal compartmental voltages and persistent sodium current)
Additional test functions (more info available HERE)
More data analysis scripts (UsefulFunctions.R and jpgToGif.py)