Updated indexing for accurate progress and improved raw ndx values.

Updated indexing for accurate progress and improved raw ndx values.
The sending side now has a sorted file-list in iconv mode so that it
can output progress in sorted order.  Simplified the over-the-wire
index values to ensure both sides will always agree on the values.
Optimized the allocation of the dir_flist->sorted array on the
receiving side with --iconv and incremental recursion.