`ph-mode' is a global minor mode for easy opening/closing/switching
groups of related files (commonly called "projects").

For general design see `doc/structure.org'.

Features:

* Nothing to configure.
* Support any types of projects & any files.
* Ido-style project files switching.
* Any number of opened projects simultaneously.
* Auto-remembering/-forgetting what file belongs to a project.
* Open/close project files with 1 command.
* Doesn't touch your Emacs configs & doesn't write anywhere except 1
  special file in project directory.
* Detects file moving withing project sub-directories & outside of
  project directory.
* Menu for quick projects switching.