A round of cleaning up some stuff before making bigger changes.

• Removed method _determineColumnIndexes(). It's not being used and useless as it is.
• Moved code for checking consistency value field to its own method.
• Replace line drawing code with call to _line() - 1 instance
• Used aliases for certain variables paths when these were obvious - 3 instances.
• Combined line drawing code for grid style
• removed/added empty lines
• some comment cleanup (mostly my own)