* Fixed broken pre-open logic

* Updated the pre-open logic to better handle RAR5

* Minor code re-structuring

* Added full support for RAR1.5 format.

* Minor code clean-up

* Added creation of $(DESTDIR)/$(sbindir) in
  Makefile.am before attempting to install the
  mount helper utility softlink.
  Thanks to ssuominen for the patch.

* Fixed a memory corruption bug when using libunrar5
  in combination with volume name lookup causing
  intermittent crashes.

* Replaced RAR_EXTRACT with RAR_TEST in calls to
  RARProcessFile(). The wrong behavior when using
  RAR_TEST has been fixed in UnRAR source v5.0.2.

* Added a missing call to RARFreeArchive()

* Removed an incorret assert()

* Fixed a compilation problem introduced in last version
  for UnRAR source releases earlier than v5.0.x

* Fixed a bug in the volume file number and offset
  calculation for RAR5 archives in store mode.