use new strconv API

All but 3 cases (in gcimporter.go and hixie.go)
are automatic conversions using gofix.

No attempt is made to use the new Append functions
even though there are definitely opportunities.

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/5447069
diff --git a/test/fixedbugs/bug260.go b/test/fixedbugs/bug260.go
index 34757c7..91dc89f 100644
--- a/test/fixedbugs/bug260.go
+++ b/test/fixedbugs/bug260.go
@@ -24,8 +24,8 @@
 	report := len(os.Args) > 1
 	status := 0
 	var b1 [10]T1
-	a0, _ := strconv.Btoui64(fmt.Sprintf("%p", &b1[0])[2:], 16)
-	a1, _ := strconv.Btoui64(fmt.Sprintf("%p", &b1[1])[2:], 16)
+	a0, _ := strconv.ParseUint(fmt.Sprintf("%p", &b1[0])[2:], 16, 64)
+	a1, _ := strconv.ParseUint(fmt.Sprintf("%p", &b1[1])[2:], 16, 64)
 	if a1 != a0+1 {
 		fmt.Println("FAIL")
 		if report {
@@ -34,8 +34,8 @@
 		status = 1
 	}
 	var b2 [10]T2
-	a0, _ = strconv.Btoui64(fmt.Sprintf("%p", &b2[0])[2:], 16)
-	a1, _ = strconv.Btoui64(fmt.Sprintf("%p", &b2[1])[2:], 16)
+	a0, _ = strconv.ParseUint(fmt.Sprintf("%p", &b2[0])[2:], 16, 64)
+	a1, _ = strconv.ParseUint(fmt.Sprintf("%p", &b2[1])[2:], 16, 64)
 	if a1 != a0+2 {
 		if status == 0 {
 			fmt.Println("FAIL")
@@ -46,8 +46,8 @@
 		}
 	}
 	var b4 [10]T4
-	a0, _ = strconv.Btoui64(fmt.Sprintf("%p", &b4[0])[2:], 16)
-	a1, _ = strconv.Btoui64(fmt.Sprintf("%p", &b4[1])[2:], 16)
+	a0, _ = strconv.ParseUint(fmt.Sprintf("%p", &b4[0])[2:], 16, 64)
+	a1, _ = strconv.ParseUint(fmt.Sprintf("%p", &b4[1])[2:], 16, 64)
 	if a1 != a0+4 {
 		if status == 0 {
 			fmt.Println("FAIL")