WIP: first draft of a non-functional annotation folder pane

Note: the displayed items are your actual PIMO concepts!
Merge remote-tracking branch 'origin' into filter
Fix wrong scope for RPCCall
Fix sidebar rebuild check in rpc response
Eliminate weak operators, as they are evil
Merge commit 'a2cbeb94430aff41f733543da0e6228d0b4afe20' into filter

Conflicts:
	code/chrome/content/sidebar.js
Merge branch 'refs/heads/master' into filter

Conflicts:
	code/chrome/content/overlay_tb_main.js
	code/chrome/content/sidebar.js
	code/chrome/content/sidebar_tb_main.js
	code/components/autocomplete.js
Replace "var" by "let" where possible
Merge branch 'master' into filter

Conflicts:
	code/chrome/content/overlay_tb_main.js
	code/components/autocomplete.js
Another merge commit