Contribution: Serial port access

[Daniel Engeler]

Hi,

this is my first contribution to Emacs: Serial port access for GNU/ 
Linux, Unix, and Windows. The changes provide mainly `serial- 
term' (similar to `term') and `make-serial-process' (similar to `make- 
network-process'). This lets Emacs read from and write to serial  
ports. Serial port parameters such as speed and bytesize can be  
configured interactively.

All changes are fully documented, in every function and in the  
documentation.

I tested the code on Mac OS X 10.5.2 and Windows XP SP2. I  
additionally compiled it on GNU/Linux (Fedora Core 5).

I hope it works fine!

Regards,
Daniel Engeler

engeler-serial.diff
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