Add tasks for all the new languages

Task/Catalan-numbers/FunL/catalan-numbers.funl

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+import integers.choose
+import util.TextTable
+
+def
+  catalan( n ) = choose( 2n, n )/(n + 1)
+
+  catalan2( n ) = product( (n + k)/k | k <- 2..n )
+
+  catalan3( 0 ) = 1
+  catalan3( n ) = 2*(2n - 1)/(n + 1)*catalan3( n - 1 )
+
+t = TextTable()
+t.header( 'n', 'definition', 'product', 'recursive' )
+t.line()
+
+for i <- 1..4
+  t.rightAlignment( i )
+
+for i <- 0..15
+  t.row( i, catalan(i), catalan2(i), catalan3(i) )
+
+println( t )