Comment 9 for bug 340203

Per discussion with Hank, changed the scheme back so that what is physically
on the left side is marked LEFT in the scandata, and what is physically on the
right side is marked RIGHT in the scandata. (This still requires touching several
files because the code generally, and up until now, rightfully determined the
handedness solely on the basis of the page index.)

An example is http://www.archive.org/details/zdanh_test_017q_rl
The example is kind of crummy because i managed to cut off
the odd page numbers in scanning. However the covers show what's
going on i think.

The new book reader does fine on it.

The pdf still has a problem of putting pages on the wrong side, but i think
we can deal with this (i.e., fix it) without too much heart ache.