Plone.mls.listing

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- Use plone.api.portal.send_email to send emails. Fixes utf-8 encoding issues.

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- In agent contact form, use sender for email 'from', instead of 'reply-to'.

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- Fix CSS.

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- Fix manifest.

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- Add single beds and baths for listings (hidden with CSS by default).
- Use high resolution lead image for listing collections, if available.
- Add listing description for listing collections (hidden with CSS by default).
- Add calculated price for listings (hidden with CSS by default).
- Remove colons after labels from listing templates (now added via CSS).
- Clean up listing templates.
- Fix base_url for print listing links.
- Remove international phone validator from agent contact form again.
- Added setting for required status of agent contact form phone field.
- Added backport of custom title and dublin core viewlets from ps.plone.mls.
- Update buildout environment.
- Fix code-analysis errors.
- Remove Google Maps API from portal_javascripts.
- Google Maps now uses configured API key.

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- Remove wrong class names from listing detail template.
- Add living and interior area for print listing template.