Hashtable comment cleanups & renamings

[François Dumont]

Hi

 Â Â Â  I got tired of '__n' being used in _Hashtable for many different 
purposes: node, bucket, bucket count, bucket hint. It makes the code 
difficult to read. This code makes sure that __n is a node except is 
some very limited use cases where the method name is clear enough to 
tell what __n means.

 Â Â Â  So I'd like to commit this patch which only change that and some 
comments before moving forward to more serious stuff. The only code 
change is a use of auto return type on _M_allocate_node.

 Â Â Â  My main concern is the ChangeLog entry. Is the following entry ok ?

 Â Â Â  Rename variables and cleanup comments.
 Â Â Â  * include/bits/hashtable_policy.h
 Â Â Â  * include/bits/hashtable.h

 Â Â Â  Tested under Linux x86_64 (even if it can't be otherwise)

François

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