New S-Group type Query component level grouping

[AlexanderSavelyev]

Background
There is no way to create level component grouping for SMARTS

Solution

• Create a new S-group type: "Query component"
• No available fields to edit
• User can select atoms and bonds from molecules. The s-group should be applied to whole fragments (e.g. if select 1 atom from 1 fragment and 1 atom from another fragment - all atoms and bonds from both fragments should be added to the s-group)
• Display of brackets of s-group should be the similar as for "multiple group"
• If user mouse-over the group - then tool-tip appears "Query component"
• 1 fragment cannot be part of two query components. If user selects existing fragment from existing component, creates new Query component, then error message should appear "Cannot create a query component: one fragment can only be part of one query component"
• If change a type from existing s-group (e.g. data s-group) to the "Query component" type then all the atoms should be added from the whole fragment