made TOTALS header row its own row; removed totals labels; spaced totals evenly and aligned with their repspective columns
fixed aggregate totals
fixed totals display spacing for mixed property and field columns
added utils module; added date-picker class to DateTimeFields and added data-date-format attribute to both Date and DateTimeFields
changed utils.javascript_date_format to expect Django template format codes, rather than strftime C codes
fixed bad Date and DateTime Field check logic