doap: Expand on XEPs implemented by mod_time

util.human.io: Add brief test of table generation

util.dbuffer: Don't use # operator in tests, Lua 5.1 doesn't support __len

net.dns: Disable jitter for default resolver (used by blocking dns.lookup() calls) This fixes 'prosodyctl check dns' being slow.

util.dependencies: Quiet luacheck

util.dependencies: Tone down lua-unbound dependency for now At least until packages are available Wording from MattJ

util.dbuffer: dynamic string buffer Similar to util.ringbuffer (and shares almost identical API). Differences: - size limit is optional and dynamic - does not allocate a fixed buffer of max_size bytes - focus on simply storing references to existing string objects where possible, avoiding unnecessary allocations - references are still stored in a ring buffer to enable use as a fast FIFO Optional second parameter to new() provides the number of ring buffer segments. On Lua 5.2 on my laptop, a segment is ~19 bytes. If the ring buffer fills up, the next write will compact all strings into a single item.

util.dns: Update RR types from IANA registry

util.prosodyctl.check: Use net.unbound for DNS if available Improves performance somewhat by avoiding the rate limiting in net.dns

net.resolvers: Remove FIXMEs obsoleted by switch to libunbound