Add option for including indicated source code lines to printout

Add "--printlines" option (default=no) which will cause indicated
source lines to be included into the output. Source lines are
fetched with sed tool.

This also change the output where --printlines=no by removing
"(discriminator n)" from addr2line output with this change:
+            (path, line_no) = (path, line_no.split(' ',1)[0])