Move entry from ChangeLog to doc/ChangeLog.

	* doc/guile.texi (Writing a Guile Pretty-Printer) <example>:
	[...]
Remove doc/ in recent entries.
Split python docs into separate file.

	* Makefile.in (GDB_DOC_FILES): Add python.texi.
	* gdb.texinfo (Python): Moved to ...
	* python.texi: ... here.  New file.
Add g10 support to rl78-tdep.c.

The g10 is an rl78 variant which has fewer registers.  Aside from the
obvious addition of a new register_name() function which omits
registers which the g10 lacks, this change also updates the
return_value() function with the conventions specified by the ABI for
finding and setting return values.

	* rl78-tdep.c (rl78_g10_register_name): New function.
	(rl78_return_value): Add g10 support.
	(rl78_gdbarch_init): Register rl78_g10_register_name for the
	g10.