Merge pull request #68 from LHansoon/issue-67

issue-67: Update app_win.spec

Merge pull request #61 from LHansoon/issue-60

issue-60: prevent drop to self

Merge pull request #57 from LHansoon/issue-56

issue-56: round the number to 2 decimal places in ui when drag and drop

Merge pull request #54 from LHansoon/issue-53

Issue 53: drag and drop

Merge pull request #52 from LHansoon/action-update

issue-51: Action update