ring.el patch: new functions member, next, previous, convert-sequence etc.

[Drew Adams]

The attached patch to ring.el provides these new functions:

`ring-convert-sequence-to-ring',
`ring-insert+extend', `ring-remove+insert+extend',
`ring-member', `ring-next', `ring-previous'

Change log:

2007-10-08  Drew Adams  <address@hidden>

  * ring.el: Added functions
    ring-convert-sequence-to-ring, ring-insert+extend,
    ring-remove+insert+extend, ring-member, ring-next,
    ring-previous

ring-2007-10-08a.el
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