get from the receiver.

for a long-standing bug combinding -H with --compare-dest.

- Added BITS_SET() and BITS_SETnUNSET() defines.
- Got rid of unused HL_* defines.
- Got rid of no-longer-needed struct hlist.
- Changed F_HL_LIST() to F_HL_PREV().
- Added F_NOT_HLINK_FIRST() and F_NOT_HLINK_LAST().
- Got rid of WITH_HLINK and WITHOUT_HLINK.
- Got rid of the hlink_pool in the file list.

- Turned maybe_ATTRS_REPORT var into a global for use by hlink.c.

- Improved the function names.
- Improved a few variable names.
- Got rid of the "is a hard link" message in favor of the normal status
  messages for files (e.g. --itemize-changes indicates hard-links).
- Fixed a long-standing bug when combining -H with --compare-dest.
- Made sure that code compiles when hard-linking is not available.

file list ever has a pool for hard-linking.

compilers don't complain about the value getting smaller.

  allows us to delay opening a temp file to hold the list of deletions
  until we overflow the buffer (and thus, it's not usually needed).
- Fall back to doing a --delete-after pass if the --delete-delay
  code has a temp-file-writing failure.

for the mode.

- Use the new device defines: F_RDEV_P(), DEV_MAJOR(), and DEV_MINOR().

- Use renamed F_HL_IDEV() define.

- Renamed F_IDEV() to F_HL_IDEV() and F_HLIST() to F_HL_LIST().
- Changed device defines to be: F_RDEV_P(), DEV_MAJOR(), and DEV_MINOR().

from the waitpid() call.

- Tweaked a couple variable names.
- Changed the #ifdefs to not define any hard-link functions
  when hard-linking is disabled.