add org-attach reference to readme

fix some bugs

insert missing quote

bump version to 1.4.0

restore obtaining automatic precise information from region

Fix sole frame deletion error

Try to fix "Attempt to delete the sole visible or iconified frame"

Fix variable renaming and shut up byte compiler

Support annotating documents attached to the heading

Move org-noter-integration file to subdirectory to prevent it from being included in the package

Add support for other types of location references

Fixes

Add support for org-pdftools pdf-isearch link and finish refactor org-noter-create-skeleton

Fixes

Try to modify the org-noter-create-skeleton