All the TODOs sprinkled throughout the code!

Configurable rotation of replay and debug logs.

Add a make install/uninstall/etc., add an "INSTALL" file, include a dependency listing.

"|| LOG_MODE" should be "type == LOG_MODE" in logging.c.

macOS compiler may need limits.h included in structures.h.

replaymode = "lastspoke" causes huge amounts of spam from extractnickfromprefix() and friends in full debug mode.

Very slow processing of removenickfromallchannels() when another user QUITs (sometimes).