Fixed file copying, added permanent deletion feature

• smoother drawing to reduce/remove flicker
• add ~, /, Space keybinds (see README or man page)
• abbreviate $HOME to ~ in paths

Added page up and page down keys, which can also be used with J or K or Shift+Up or Shift+Down.

Fixed an unimportant bug with the last version.

Added environment variable $CFM_CD_ON_CLOSE.

Added a cd-on-close feature and some other enhancements

Going up a directory is nice now. 0.6.x will likely be the last versions before the 1.0 release :)

Fixed deleting again

Fixed a typo in the man page and generally updated docs

Fixed bug with copying and fixed a crash with stdin issues