Don't emit line tags when source code is printed as part of package documentation using templates. The line tag interferes with the anchor tag introduces by the template.
Don't emit line tags when source code is printed as part of
package documentation using templates. The line tag interferes
with the anchor tag introduces by the template.

This fixes an an issue where some headers lost their ability
to link to the respective source code.

R=rsc
http://codereview.appspot.com/154166

tav/go,tav/go,tav/go,tav/go,tav/go,tav/go,tav/go