[LMS-1369] longer description; tooltips with line breaks; unified tooltips

.../client/web/client/application/AbstractAsyncCallback.java

...neric/client/web/client/application/GenericConstants.java

...ic/client/web/client/application/framework/LoginPage.java

...eneric/client/web/client/application/menu/InfoButton.java

...eb/client/application/model/renderer/TooltipRenderer.java

...eb/client/application/ui/data/DataSetReportGenerator.java

...lient/web/client/application/ui/data/DataSetTypeGrid.java

...tion/ui/experiment/ProjectSelectionTreeGridContainer.java

...b/client/application/ui/field/CodeFieldWithGenerator.java

...ent/web/client/application/ui/field/DescriptionField.java

...c/client/web/client/application/ui/field/ReasonField.java

.../client/application/ui/grid/BrowserGridPagingToolBar.java

...web/client/application/ui/grid/ColumnSettingsChooser.java

...lication/ui/property_type/PropertyTypeAssignmentForm.java

.../application/ui/property_type/SectionSelectionWidget.java

...b/client/application/ui/search/DetailedSearchToolbar.java

.../client/application/ui/user/ChangeUserSettingsDialog.java

.../client/application/ui/vocabulary/VocabularyTermGrid.java

...ic/client/web/client/application/ui/widget/FieldUtil.java

.../generic/client/web/client/application/util/GWTUtils.java