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(to make navigation easier)
basic help panel worx
a start at sizing the help panel

i see i could get a little worked up here, better take a break.
abstract column resizing stuff into UI.column base class
couple missed privatizations
consistently update the middle column from side show/hide methods
get/set user options
persist collapsedness of left/right panes

i am not at all sure about this extra ui-load phase
especially as it makes startup even jumpier

but it's a start
only set colwidth if different
proper help icon (or should it be question-sign?)
rename accordion to accordion-left for consistency
first stab at sending errors flexibly

they need to be sent to the main pane if
* there is no session pane (view mode)
* it's the reconnect message

this is a first step, not working yet
artifacts
missing file
allow no assets
Merge branch 'develop' into feature/help-panel

Conflicts:
	htdocs/js/rcloud_bundle.min.js
rename collapse divs & give them data-colwidth
decently generalized collapsible columns
support fetching multiple user options at once