bug #34302: Feature request : device configuration with parent classes

(not in original patch) 
* avrpart.c: New function avr_dup_opcode. avr_dup_mem/avr_dup_part-
	functions now duplicate the opcodes in their op-array to avoid memory leaks.
* doc/avrdude.texi: Added description of part parent f

git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1028 81a1dc3b-b13d-400b-aceb-764788c761c2

doc/avrdude.texi

@@ -1529,13 +1529,34 @@ part
 @end smallexample
 
 @menu
+* Parent Part::
 * Instruction Format::
 @end menu
 
 @c
 @c Node
 @c
-@node Instruction Format,  , Part Definitions, Part Definitions
+@node Parent Part, Instruction Format, Part Definitions, Part Definitions
+@subsection Parent Part
+
+@noindent
+Parts can also inherit parameters from previously defined parts
+using the following syntax. In this case specified integer and 
+string values override parameter values from the parent part. New 
+memory definitions are added to the definitions inherited from the 
+parent.
+
+@smallexample
+   part parent <id>                              # quoted string
+       id               = <id> ;                 # quoted string
+       <any set of other parameters from the list above>
+     ;
+@end smallexample
+
+@c
+@c Node
+@c
+@node Instruction Format,  , Parent Part, Part Definitions
 @subsection Instruction Format
 
 @noindent