port fa32a9a7d3876ce91eb46d5f0a46f9ee1db81b2a from Pd-l2ork: debuild: Add back rsync to the build dependencies

port 0781aacf518127805b9b343192fe1bc2f7175734 from Pd-l2ork: debuild: Fix up Gem build dependencies, remove hardcoded shlib deps

port f5548e4d479c9e8f056cd8effe54d186efc036df from Pd-l2ork:  debuild: Fix up hard-coded run-time dependencies

port 3ab3622fa71909fc2c91dd0270a2ae759ecd7706 from Pd-l2ork: Remove alternatives in run-time dependencies, these will be added by dh_shlibdeps as needed

port 38d39242eed2e893f66a47ed98209890abc5d77e from Pd-l2ork: debuild: add alternative dependencies for compatibility with older Ubuntu versions

port 93c4266dcbd1444af39a60e9638484eb482d9451 from Pd-l2ork: Update debuild packaging system for latest pd-l2ork source and Ubuntu 16.04