Add tasks for all the new languages

Task/Call-a-function/Phix/call-a-function-1.phix

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+{} = myfunction()

Task/Call-a-function/Phix/call-a-function-2.phix

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+{cities,populations} = columize(muncipalities)
+{{},populations} = columize(muncipalities) -- discard result[1]
+{cities,{}} = columize(muncipalities)   -- discard result[2]
+{cities} = columize(muncipalities)  -- ""

Task/Call-a-function/Phix/call-a-function-3.phix

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+function myfunction(integer a, string b="default")
+    return {a,b}
+end function
+--? myfunction() -- illegal, compile-time error
+?myfunction(1) -- displays {1,"default"}
+?myfunction(2,"that") -- displays {2,"that"}

Task/Call-a-function/Phix/call-a-function-4.phix

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+?myfunction(b:="then",a:=3) -- displays {3,"then"}
+--?myfunction(b:="though") -- compile-time error

Task/Call-a-function/Phix/call-a-function-5.phix

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+constant integer r_my_func = routine_id("myroutine")
+?call_func(r_my_func,{1}) -- displays {1,"default"}

Task/Call-a-function/Phix/call-a-function-6.phix

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+s = append(s,item)