adding some images from the ingame help and copying over text from the
ingame help (the part about traits and such) directly update the
respective translation files, since this happens anyway when I build
the manual file...
+ ./configure checks for manual-related tools.
+ Updated update-po and update-po4a targets.
+ Build the HTML files at `make dist' time (work in progress, the files
are not yet included in the tarball).
* Copyright holder now set to "Wesnoth Development Team" in po4a domains.