[_] 16% general tasks
	[_] % actions:
		[_] import
		[_] export/build
		[_] list/search tags
		[_] list/search content
	[_] % UI
		[_] HTML/HTML5
		[_] QT (???)
		[_] command-line
			[_] ig
			| root script... name not final yet...
			[_] ig-init
			| create an empty archive...
			[_] ig-clone [OPTIONS] [TAGS] URL
			[_] % ig-sync
				[_] git-like interface
					[_] push/pull
					[_] clean
					[_] gc
			[_] ig-import [OPTIONS] [TAGS] PATH
			[_] ig-export [OPTIONS] [TAGS] PATH
			[_] ig-tags [OPTIONS] [TAGS]
			| either list all the tags or if any tags are given as input, list 
			| related tags...
			[_] % ig-select [OPTOINS] [TAGS]
			| list paths/ids of images tagged by tags.
				[_] % support complex queries
					[_] all (default)
					[_] any
					[_] none
			[_] ig-do ACTION [OPTIONS]
			| same as ig-action
	[_] 0% save diffs in pickle overlays...
	| need fast and simple way to save changes to a new spot...
		[_] 0% IDEA: use pli.logictypes.DictUnion
			[_] create a new layer on load
			[_] save only updated layers and create a new empty layer on save
			[_] be careful not to update other layers...
			| this can happen when adding a new object to a tag via an .update(...) method, in-place.
			|
			| need to use immutable data only.
	[_] 0% compleate the new tags module
		[_] .relatedtags(...)
		[_] concatinative mode or abbility to build new tagsets from selections
	[_] import test images and ratings
	[_] importer based on xmpgen
	[X] need unique image id