... there's just too much space.

The 'history' mode allows incrementally creating item list by typing
items directly to dmenu.

Also, stderr and stdout are now kept automatically for all menus.

No, no sensitive information is being passed here :)

(I should probably implement the memory part in bmo somewhere.)

Let's keep ini file names consistent with tool names.  Since bmo-uris is
gone, this is not even a shared file anyway.

Basically

 1. I like the verb more ("bmo, wish ..."),

 2. it removes potential tab-friendliness conflict with another
    sub-command I'm fancying,

 3. last, but not least, the obvious alias won't have to be 'bj'.

AFK and GONE have dedicated key bindings, so they don't need to be
first.  BACK is never meant to be called manually anyway.

UNDOCKING and ZLEEPING may often be needed in hurry, though, DOCKING
normally comes soon after them.

Don't let all the bmo processes hang

Just single level for now...

saturnin v0.0.21+ adds new flexible menu handler so we don't need to
keep long pipes around in i3/config