Carsten Klein 3571b7e3dd
Allow searching issues by ID ()
When you are entering a number in the issue search, you likely want the
issue with the given ID (code internal concept: issue index).
As such, when a number is detected, the issue with the corresponding ID
will now be added to the results.

Fixes 

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
..
db.go Allow searching issues by ID ()
options.go Rename project board -> column to make the UI less confusing ()