OO-1741 remove ? from dummy avatar images, adding anonymous avatar and removing old avatar images outside the theme

OO-1343: add three different style choices to catalog, refactor the catalog admin, refactor the image pipeline of the catalog to reduce the number of scaling

OO-1341; make the extension of the image mandatory, needed by the java scaling service to discover the type of the image

OO-1068 OO-1113 more bootstrapify of forum, refactor redundant avatar image code, add forum attachment preview

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