Added column to Inmates page, added more info to General Stats page, and improved General Stats code

Added column to display charges description to the Inmates page.

Added male and female breakdowns on number of booking information.

Added stay duration for longest held prisoner.

Modified General Stats code to use models to store computed stats information and refactored code to use more function styles. Did this by eliminated all for loops and using instead the underscore operators, each, reduce and filter, to do the processing.

Fixed a few errors discovered during refactoring.