Release V3.1

Highlights or big features on the version V3.1:

• Improve UI
• Copy a system to another system

Entity list or detail

• Copy a system to another system with the options

  • Copy only the system
  • Copy system tree
  • Copy the system and child instances
  • Copy system tree and descendant instances

  

  Copy system with options

UI

• The top bars of three areas (system tree, entity list, and entity detail) are all fixed.
• Add a "more" button into the top bar of entity detail area when there is no space to display all buttons on narrow screen.
• Adjust the size of editing area automatically when inputting text (Firefox does not support it now, and the version of Firefox 152 maybe support it)
• Other improvement of UI

Other

• Fix some bugs