BackupPC-XS 0.52 released

Minor changes: updated config.guess and config.sub; fixes problem with aarch64 and ppc64le reported by Denis Fateyev.

BackupPC-XS-0.51 released

Minor update:

• Added dynamic:: target to md5/Makefile.PL and zlib/Makefile.PL to fix build issue on gentoo (patch submitted by Slaven Rezic).

BackupPC-XS-0.50 released

Several significant changes and bug fixes. This version is required for BackupPC 4.0.0.

The two most significant changes are:

• Reference counting is now per-backup; replaced static delta information with callable interface.
• Attribute files are now zero-length with the md5 digest encoded in the file name.