Translations:Units/62/en

It must fulfills some conditions that should be checked before activating the unit management system. These conditions are:
 * check that all base units are defined
 * check that a dimension is not defined twice through the units
 * check that a symbol is not defined twice in all the existing symbols
 * check that the signatures of all units have all the same size
 * chacke that a standard symbol (for which magnitude is 1) is defined for all units