MASSIVE changes to the code but this is because I'd not had git runni…

…ng properly for a couple of weeks so regular small commits didn't happen as usual >.<

Added a 'modaCheckpoint' function that can be called and will temporarily halt script execution while giving an indication of where in the script is currently being executed - useful to hunt down which part of a script is freezing for example (find last place alert was called and bug will be just after this..)

Altered code style throughout to have a space following a comma;

Starting to migrate to the new userPreference() interface;

Added a bunch of translation strings;

Source of freezing on the initial setup appears to be when setting the numberOfRentedReferrals - when the setPref('numberOfRentedReferrals', tmp_rentedRefs[1], { prefType: 'integer' }); part line is replaced by a 0 the script setup does not freeze;

throw if setup isn't complete rather than return (return causes issues when being run within the firebug console as it isn't within a function block - greasemonkey automatically wraps scripts within an anonymous function);

added checks to the referral listings functions so that they do not cause issues if the item is not supplied / is null -- eg, on the direct referral listings page the flagIdToColour does not have a flagId to convert thus breaks, similarly for ultimateClickValues;

 improved direct referral listings page functionality so that (hopefully) it isn't as broken / it actually works somewhat (eg only try to textify the flag if it is the rented referral listings page / column indexes are distinct for each listings page);

 Removed alert()s when pages break - TODO stop catching errors and just let the script fail;