Updated the Navar bank to include a gold -> silver conversion table; addresses bug# 1832558 - Silver conversion

git-svn-id: svn://svn.code.sf.net/p/crossfire/code/maps/trunk@7537 282e977c-c81d-0410-88c4-b93c2d0d6712

navar_city/misc/city1bank

@@ -458,6 +458,15 @@ arch cobblestones
 x 3
 y 10
 end
+arch silver_converter
+name convert gold into silver
+slaying goldcoin
+other_arch silvercoin
+sp 10
+food 1
+x 3
+y 10
+end
 arch cobblestones
 x 3
 y 11
@@ -576,6 +585,15 @@ arch cobblestones
 x 4
 y 10
 end
+arch silver_converter
+name convert gold into silver
+slaying goldcoin
+other_arch silvercoin
+sp 10
+food 1
+x 4
+y 10
+end
 arch cobblestones
 x 4
 y 11