Fix upload box CSS
Remove SearchEngineInterface::clearAllCache, keep last hour phrasea cache
Merge pull request #923 from romainneutron/upload-css

[3.8] Fix upload box CSS
Merge pull request #924 from romainneutron/phrasea-cache-cleaner

[3.8] Remove SearchEngineInterface::clearAllCache, keep last hour phrasea cache
Merge branch '3.8'

Conflicts:
	lib/Alchemy/Phrasea/SearchEngine/SphinxSearch/SphinxSearchEngine.php
Migrate demand table to doctrine entity && refactor registration API
Fix neutron's comment
Fix tests, CS && typo
Rename RegistrationManager to RegistrationManipulator
Adressed Neutron's comments