rsnapshot 1.4.4

• Add sentence explaining rsync_long|short_args + sign to man page
• Fix rsnapreport problems (incorrect header, fail when rsync present, fail with LVM)
• Add notes about documentation, and link to the website repo
• Fix for 'rsync_cleanup_after_native_cp_al() only works on directories' fail when sync_first on and cmd_cp not set (#133), add test
• Fix for rm -rf failing when the path contains ./
• Suppress noisy error from non-GNU cp on BSD-ish machines, including MacOS
• Add CentOS 7 to successfully tested to docs
• Minor tidy up rel configure options --with-test-(true|false)
• Update travis build settings
• Dont use m4_esyscmd_s in configure.ac
• Update docs to remove dangling refs to HOWTO on rsnapshot.org
• Skip both SSH tests (rather one) if SSH doesn't work
• Use perl-5.30 for tests (used in Ubuntu 20.04 Focal)
• Lower verbose level of rsync output to 1.3.x equivalent to work with rsnapreport.pl again
• Fix location of true and false binaries on macOS