Mostly just tidy up, catching pages that I missed the first time round.
A small number of pages were given a bit more reformat. A bit beyond
the remit of this merge request but not too much has been changed.
* PROBLEMS: Point to pnm/saned security risks.
* TODO: Removed the entries about epson usb mis-detection and check
for installed sane versions.
* configure configure.in backend/Makefile.in: Added detection of older
versions of SANE. The pnm backend is now disabled by default.
* backend/dll.c backend/dll.desc: Fixed file descriptor leak (found by
Douglas Gilbert). New version: 1.0.2.
* backend/net.desc: Added Jochen Eisinger's email address as contact
for the net backend.
* doc/sane-pnm.man: Point to pnm/saned security risks.
Ralph Little