Rtorrent Versions Save

The feature-bind branch is still not ready, so here's more bug-fixes and pull requests merged.

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• Close log files when reusing a name. (pyroscope)
• Increased max timeout for tracker requests.
• Set max piece size 512mb.
• Switch to C++11 MRT RNG for random bytes. (lps-rocks)
• Added support for openssl 1.1.
• Fix honoring throttle.min_peers* settings in rtorrent. (chros)
• Improved failed tracker bencode parsing. (chros)
• Added example rtorrent.rc. (g0tmi1k)
• Added a temporary name filter. (Toff)
• Added 'log.close' command.
• Added 'd.tracker_announce.force' command.
• Added 'event.system.startup_done/shutdown' commands/events. (chros)
• Added 'd.custom.if_z' command. (pyroscope)
• Added 'd.multicall.filtered' command. (pyroscope)
• Added 'event.view.hide/show' commands. (pyroscope)

Bug-fix release while feature-bind is being worked on.

• Fixed ip filter memory usage. (sallyswiss/chros73)
• Add space to fmt str in log_gz_file_write. (pastly)
• Fix compilation issue with gcc v6.x and empty CXXFLAGS. (chros73)
• Fix BEP7 compatibility with IPv6 trackers and IPv4 peers.
• Include SCGI/XMLRPC example in rtorrent.rc. (ss23)
• Handle SIGHUP like SIGINT. (pyroscope)
• Fix Throttle args. (chros73)
• Fix missing ranlib - not defined but used. (duraki)
• Fix no // are at start of expanded paths. (pyroscope)
• Fix ncurses header include. (theirix)
• Fix segfault when viewing a magnet download in the leeching view. (slingamn)