Drop leading and trailing newlines in longstrings.

Long, heredoc style strings can now have
a non semantic leading newline character. This makes it
easier to define large columns of text.

examples/numarray/build.janet

@@ -4,7 +4,7 @@
     :name "numarray"
     :source @["numarray.c"])
 
-(import build/numarray :prefix "")
+(import build/numarray :as numarray)
 
 (def a (numarray/new 30))
 (print (get a 20))

examples/numarray/numarray.c

@@ -100,12 +100,12 @@ Janet num_array_get(void *p, Janet key) {
 
 static const JanetReg cfuns[] = {
     {
-        "numarray/new", num_array_new,
+        "new", num_array_new,
         "(numarray/new size)\n\n"
         "Create new numarray"
     },
     {
-        "numarray/scale", num_array_scale,
+        "scale", num_array_scale,
         "(numarray/scale numarray factor)\n\n"
         "scale numarray by factor"
     },