D-Net

[Library | Landing-redesign]: Fix a duplicate code on result landing

[Library | Landing-redesign]: Merge from trunk

[Library | Landing Redesign]:
1. result-preview.component.ts & resultLanding.component: Rename "other research outcome" to "other research product".
2. resultLanding.service.ts & dataProvider.service.ts: Do not stringify null or undefined value for description....

[Trunk | Library]: metadataPreview.module.ts: [Bug fix] Missing file changes from previous commit.

[Trunk | Library]:
searchSorting.module - searchSorting.component.ts & searchResultsPerPage.component.ts & searchFilter.module.ts - searchFilter.component.html &
browseStatistic.component.html - browseEntities.module.ts & citeThis.module.ts - citeThis.component.ts & ...

[Trunk | Library]:
1. searchResearchResults.service.ts & resultLanding.service.ts: Do not stringify null or undefined value for description.
2. claimResultSearchForm.component.ts: Do not stringify null or undefined value for accessRights.

[Trunk | Library]:
1. searchResult.ts: "description" is parsed for all entities except from "organization".
2. searchProjects.service.ts & searchDataproviders.service.ts: Parse "description" (for "projects" it is "summary")
3. searchResult.component.ts: Default value for "showSubjects" set to true.

[Library | Landing Redesign]: 1. Add feedback fields. 2. Fix subjects margin.

[Library | Landing Redesign]: Assets: Change library css.

[Library | Landing Redesign]: 1. Add pmid on identifiers (DOI first) 2. Add feedback on development in all landings. 3. Result landing add under curation.