v0.61.6-beta release

It's possible to upgrade to 0.61 only from 0.60.X. If you're on an older version, download and run 0.60.4 first. Only after that upgrade to 0.61.

Since last beta:

• sync fixes
  • sync problems are the main blocker for the stable release, hopefully it's sorted out now.
• Fix right click bookmark bug by @SiriusXT
• provide note dates in the frontend API, fixes #4232
• fix clipperInbox handling for new note creation, closes #4219
• fix orderby with multiple labels, closes #4220
• add imageStyle alignBlockLeft, alignBlockRight, fixes #4215
• fix FNote.getContent() #4210
• fix displaying 1 / 0 in find widget
• add "api.runOnFrontend()" to the backend script API
• Fix bug: Calendar display incorrect tooltips
• allow specifying date created in the ETAPI, #4199
• force migration to 0.60 first before 0.61 #4132