Rename ambiguous extent-related variables in allocation code

Hi,

Thanks for private comments to the RFC posted on Aug. 21.

As a first step, this patch only renames the variables, with 2 exceptions:
1. 'remaining' in _alloc_parallel_area() is just replaced with 'goal_le - *current_le'
2. Update comments accordingly

No change in the functionality.
The patch is made to applicable to and tested on today's CVS head + pvmove cleanup patch below.
https://www.redhat.com/archives/lvm-devel/2007-August/msg00068.html
Dependency to the pvmove patch is only about the patch context, so the change itself is valid without it.

Please consider to apply.

Thanks,

Jun'ichi Nomura, NEC Corporation of America

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