Update French translation
Add polkit rule so members of group "kalu" don't need auth to run a sysupgrade

This obviously only affects sysupgrade ran through kalu's updater. The group
name can be set on configure. It's also possible to just copy the file to
/etc/polkit-1/rules.d to overwrite it at "runtime".
Fix man page (remove obsolete paragraph)
Set user-agent via environment variable HTTP_USER_AGENT; Fix #5

Setting a user-agent isn't a bad idea, it also fix issue with some server/repo
where lack of one resulted in a download error (HTTP 406).
Can specify --debug multiple times

- 2 times to add messages from ALPM
- 3 times to include ALPM's level DEBUG & FUNCTION
Change how icons are loaded, allowing easy override

All 4 icons used are now loaded from the theme - "kalu", "kalu-paused",
"kalu-gray" & "kalu-gray-paused" - so that users can easily override any (and
all) of them, simply putting files correctly named in ~/.local/share/icons
Update README: fix old URL; format text
configure.ac: Add option subdir-objects

Required with the new version of automake.
Bump to 2.2.0: Update HISTORY