annex-cmd: Add -D option to filter directories

b80efeb6-6fd9-11e3-af8a-001f3b596ec9
annex-cmd: Process annexes under /media/ before $HOME

Things like "ga get --auto" should be executed there first.

d73d6704-6fda-11e3-ad98-001f3b596ec9
lpar: Execute "lpar -a" at the end if !$Opt{'all'}

99f34aae-6fde-11e3-94c9-001f3b596ec9