Fix lint errors

WIP: better aggregation algorithm and dataset spec upgrade. New grouping with tests; added debug mode to graph which displays ids on nodes and links to better visualize the algorithm

Merge branch 'new-network-graph' of gitlab.fi.muni.cz:xrehacek/analysis-vis-prototype into new-network-graph

GraphLink: color sticky paws on hover (#2); switch left and ctrl click on nodes; store/data minor docs, add ungrouping hierarchy test - failing

This reverts commit 82a3a47b

Set new inAggregation for a link recursively, until last node in series of aggregations is found.

Store/data (#13): rewrite ungroup_nodes for basic scenarios; decompose group_nodes in insertLink; wip: remove_nodes, removing original entries sets isRemoved (changed dataset specs); remove gettter for new Id (should not be public)

Remove error in dataset-harry.

BaseIcon: compute radius.

Node/link: show alert when trying to render with invalid id.

Data/store: WIP modified ungrouping to handle different grouping order, working for 2 groups. Needs testing, possibly buggy (#13)

NetworkGraph: separate synchronization with store into methods; add saving of node positions; add handler for ungrouping; solve d3-force IDs
NodeDetailCard: add ungrouping option
Store/data: fix and test update nodes (needed deep merging); fix grouping; add action for ungrouping

Update packages, setup Jest for testing. Implement and test store/data/GROUP_NODES (#13) for general groups. Updated dataset format.

Needs testing. Optionfor grouping available after selection in NodeSelection

Added visuals for group in GraphNode

GraphNode: instead of move event now runs callback passed down from NetworkGraph.

Prepare for production: turn off history mode in routing, set public path, BaseIcon: use webpack imports for assets instead

Graph: show simulation variables, pause/restart controls; solve performance issues by adding temporary links when running force simulation – closes #21

Store/interaction: fix selecting a node with id=0

BaseIcon: fix image dragging.
GraphNode: rename event for consistency.
Minor formatting.