man2html: Apply Debian patches (part 2: hman).

man2html: Apply Debian patches (part 2: hman).

This commit applies following patches (related to hman):
001-hman-bashism.patch
  Remove bashism from hman
003-hman-browser.patch
  Rename BROWSER variable to HMAN_BROWSER in the hman.sh script
  to avoid conflict with sensible-browser's BROWSER.
014-hman-sensible-browser.patch
  Use sensible-browser if lynx can't be found.
015-hman-urlencode.patch
  Properly encode URLs given to browsers, so `hman index++' should
  work now (closes: #258027)

(Note that patch 003 and 005 seems to be Debian-specific.)