release notice (PNEdit_v2021.09)

The version v2021.09 of VeriForma's PNEdit platform was released on November 25, 2021. This release includes multiple new features, great performance improvement, and bug fixes. The following products are included. 

- PNEdit Tool: the advanced text edit tool. It is an important, efficient, and powerful component of PNFile platform. It supports various efficient text editing operations, such as cutting/copying/pasting chars/words/lines, advanced searching and replacing, syntax detecting and highlighting, undoing/redoing, etc. There are three working modes, input mode, replace mode, and command modes, in PNEdit, and rich commands/hotkeys are supported in both working modes. Besides, it supports to select text for operating in both line and column modes.