ISIS-537: remove space between label and mandatory indicator (so that indicator doesn't overflow onto next row by itself)
ISIS-537: fix markup for right-hand column panel-heading (should be span, not div)
ISIS-537: simplifying markup in EntityPropertiesPanel for additional links (same structure as CollectionsPanel)
ISIS-537: adjust margin-top of additional links for .entityPropertiesPanel, same way as we do for .entityCollectionsPanel
ISIS-537: fixing CSS for additionalLinkList class irrespective of whether applied to ul or to a div.
ISIS-537: AdditionalLinksPanel now supports being rendered either as inline-list (the original) or as a drop-down.  Instantiated through factory method throughout.
ISIS-537: simplification of HTML for StandaloneCollectionPanel; remove "btn-group" class for div around additionalLinks id in EntityPropertesPanel (not needed, that responsibility belongs to AdditonalLinksPanel itself).
ISIS-537: CSS positioning of additional links in panel-headings for properties, entity collections and standalone collections.
ISIS-537: float scalarValueWrapper left instead of right (in preparation for additional additional links to right).
ISIS-537: new @ActionLayout annotation and corresponding facet.  Applies "actions-right" CSS if there are any actions associated with property that have layout to the right.

Refactored the call to add additionalLinks so that can obtain the list of LinkAndLabel (representing the entity actions) in order to pass into the method that adds the CSS
* that method itself has been renamed/refactored: was previously called "applyLabelAtRule(MarkupContainer)", is now called "addPositioningCssTo(MarkupContainer, List<LinkAndLabel>)"
ISS-537: now renders actions to the right if annotated as such.
ISIS-537: entity actions positioned on panel are now rendered.

Also:
- renaming IDs in ScalarPanelAbstract for associated entity actions, and updating HTML
- deleting unused (empty) CSS files.
ISIS-537: width of icon column for standalone collections with bulk actions (where the column is 2nd, not 1st).

Also: change to use width: 3% rather than width: 30px.
ISIS-537: changing @LabelAt to @PropertyLayout and @ParameterLayout.

Also: fixing unit test for @ActionLayout facet.