Rearranged a few functions (eg, move url tests to be methods(?) of th…

…e currentPage object, moved the REFERRAL template out of the referralListings object); Added numberOfReferrals to userAccount object; Significant changes to the structure of how referral data is stored - now properly stores day-by-day cache of referral information (nb: not yet tested with direct referrals); Within the REFERRAL object, referral properties are now defined separately to the inner function declarations for clarity; Removed a whole bunch of redundant code (eg, old stuff now handled by the REFERRAL object, unused/old debugging code...); Moved the extra column declarations into clear single line new COLUMN() declarations; Added ability to selectively include / exclude extra column stuff based on membership type; Temporary patch for the sidebar where 'Yesterday' was including today's values in the sum too - not convinced that it is fully corrected though;