- Improve documentation...

- Extend menu language / facility

- UTF-8 support

- Splitting window support

- I18N support

- Searching scroll buffer support

- Extensible timer support

- Reduce X resource usage, like Window, Pixmap, etc.

- Xterm style mouse support, e.g., joe 3.2

- PNG and JPEG background support on Solaris looks broken

- Reliable signal handling on SIGCHLD when multiple children exit
at almost the same moment. According to APUE (Advanced Programming
in UNIX Environment) 2nd Edition Chapter 10, sigaction () allows
us to block reentry of a signal handler via its sa_mask parameter. 
But if a blocked signal occurs for multiple time during the signal
handler, they are not queued. The OS will deliver the signal only
once.

- Show icon in tabs
