Currently, there is no way to include an hline in an imported or
converted table. The `org-babel-import-elisp-from-file converts lines
starting with '-' (or '|-') to an integer 0, because, even though
`org-table-to-lisp' will correctly convert lines starting with "|-",
because `org-table-convert-region' always puts "| " at the begining of
each line.

This patch solves that by not putting a space after the pipe symbol if
the first character of the line is a dash ("-").

rick