D-Net

clean up unused files
css changes

add Robots.txt, set proper configuration in .angular-cli.jon
add JSONLD, and rel canonical url for client

Claims:
add info link

Change email headers

claimsByToken.component & mailPrefs.component: when Session is expired, redirect to '/user-info' page to show a proper message.

manage-subscribers.component & manage-user-notifications.component: when Session is expired, redirect to '/user-info' page to show a proper message (fix unhandled cases).

JSONLD:
add jsonld in all pages (advance, table view, link, deposit)
for search pages assign SearchResultsPage representation
for other pages assign Website

SEO service:
add a service that updates the rel canonical url (in client side)
call the service in each page

For every page: when Session is expired, redirect to '/user-info' page to show a proper message.

JSON-LD:
expand Dataset to use issn, headline, alternativeHeadline for dataset subtitle
fix Dataset issue to get the proper value when title is array
Add jsonld in search pages with potentialAction search to each page

Organization & Project landing page: change how CSV buttons/links work to set filename and avoid browser popup blocker.

jsonld:
move files in sharedComponents/schema2jsonld/model - not used only in
add Organization, use JsonldDocument as the default class and extend Dataset and Organization
add jsonld in search-find, org/datasource/project landing

Claims: add limit in the number of results allowed to add in the basket