This patch fixes a failure to detect EOF, and also provides "\xNN" in
strings, where NN are exactly two hexadecimal digits.  This way, your
source code can be safe to print to a tty even if the strings it
defines would not be.  If this is acceptable, I'd also like to change
print.c to use this when (write)ing strings containing control
characters.

	* read.c (scm_lreadr): detect EOF after backslash, and
	interpret \xNN hexadecimal sequences.


paul