Regenerate buffer-identification after `clone-indirect-buffer`
Use a hook instead of an advice
Homogenize `buffer-identification` for indirect clones

Arrange for newly cloned buffers to be identified as
`path/to/filename<N>` instead of the default `filename<N>`

Handles issue #98
Improved coding style
Merge pull request #99 from ffevotte/better-handle-clones2

Homogenize buffer identification between base and indirect buffers