Add Barbados 1973 Narcotic Drugs Act repealing the 1936 law

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+# Barbados 1973 Narcotic Drugs Act (new entry)
+
+- New `barbados-narcotic-drugs-act-1973` (other, 1973, checked): No. 38
+  of 1973, assented 30 July 1973, commencement by proclamation; amends
+  and consolidates narcotics law; s.22 repeals the Dangerous Drugs Act
+  1936 (confirming its number, Act 1936-3); s.6 cannabis and resin offences
+  (premises smoking/dealing, management, cultivation of "Cannabis Saliva
+  L." sic); s.20 penalties ($5,000/five years indictment, $2,500/twelve
+  months summary, forfeiture, reversed burden of proof).
+- Source read: full Act via UNODC SHERLOC (E/NL.1975/19 filing).
+- 1926-27 Barbados Dangerous Drugs Act claim (Framing Mischief paper,
+  offline, single snippet) logged as UNVERIFIED lead: the 1973 Act repeals
+  only the 1936 Act, and the checked 1936 entry stands. Do not add without
+  the paper or the ordinance text.
+- Chain bb 0 flagged.