once it is accepted that proceedings for prosecution are independent of assessment and penalty, and the Tribunal is neither the appellate nor the revisional authority in a case where prosecution is launched, the mere fact that the decision in the appeal may have an impact on the prosecution, in our considered opinion, cannot be used to read into the expressions “pass such orders thereon as it thinks fit” or “any proceedings relating to an appeal”, a power in the Tribunal to direct that prosecution or a show cause notice shall be kept in abeyance. There is another aspect of the case, namely, if such a power, as has been canvassed by the assessee, were available to the Tribunal, prosecution would have to await the final outcome of proceedings up to the Supreme Court