NEW PATRIOTIC PARTY v INSPECTOR-GENERAL OF POLICE   Constitutional law—Fundamental rights and freedoms—Freedom of assembly—Restriction on exercise exercise of—Restrictions in interest of "public safety" permissible under article 21(4)(c)—Prerequisites for imposition of restriction—Police imposing restriction on freedom of assembly of plaintiff under NRCD 68 in interest of "public order"—Whether justifiable under article 21(4)(c)—Public Order Decree, 1972 (NRCD 68)—Constitution, 1992, art 21(4) (g) and (c). 