OO-592: break direct dependency to UserDataDeletable and DeletableGroupData interfaces, remove unused spring configuration files...

OO-450 improve chat layout, imitating skype as best practice example. add link to user visiting card. change small portait image size to 30x30 to match icons available in default theme

OO-457: refactor tmp folder in OpenOLAT, use the java.io.tmpdir for all temporary files, configuration for absolute path for the indexer, fix deletion of temporary files in some archives, move qtieditor from tmp

OO-204: refactor the DisplayPortraitManager to allow portrait saved in PNG and using the new ImageHelper implementation

OO-1 : adjust memberslist coursenode css.  minor fixes : titlewrapper info-icon in courserun (single page)

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branch : bps