Remove huge amount of function clauses

Profile megaload before:
    exometer_util:table/0                    1.05%
    exometer_util:table/0                    1.36%
    
After:
    exometer_util:table/1                     0.56%
    exometer_util:table/0                     0.73%
    exometer_util:table/0                     0.69%
    exometer_util:table/0                     0.70%