only make a .ssh dir in the user's home dir
ssh public key authentication fixes: imported (PEM) and fix key unloading bug

This fixes:
1. (PEM/OpenSSH) keys would not import
2. if you had a PEM/OpenSSH key imported from another version of
    irssiconnectbot, the Public Key management activity would FC
3. PEM/OpenSSH keys would not work with the "setup PK" menu item
note for res/raw/data.tar.gz.mp3