In ColourSkillLevel(): Re-worked to have three parameters rather than eight - the rest are derived from the new first parameter, which also allowed the removal of needless variables from initDisplayStrings().

In ColourSkillLevel(): Re-worked to have three parameters rather than eight - the rest are derived from the new first parameter, which also allowed the removal of needless variables from initDisplayStrings().
checkFactions() has been re-named to HasProperRepLevel() and was re-written for clarity/efficiency and to have one parameter rather than four.
SetSortString() has been removed - its re-written code now resides in initDisplayStrings().
Modified some comments throughout the file.