Relicense to 0BSD, update mail address

I've come to the conclusion that copyright mostly just stands in the way
of software development.  In my jurisdiction I cannot give up my own
copyright and 0BSD seems to be the closest thing to public domain.

The updated mail address, also used in my author/committer lines,
is shorter and looks nicer.  People rarely interact anyway.

plugins/http.c

@@ -1,11 +1,10 @@
 /*
  * http.c: HTTP service detection plugin
  *
- * Copyright (c) 2014, Přemysl Janouch <p.janouch@gmail.com>
+ * Copyright (c) 2014, Přemysl Janouch <p@janouch.name>
  *
  * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
+ * purpose with or without fee is hereby granted.
  *
  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

plugins/irc.c

@@ -1,11 +1,10 @@
 /*
  * http.c: IRC service detection plugin
  *
- * Copyright (c) 2014, Přemysl Janouch <p.janouch@gmail.com>
+ * Copyright (c) 2014, Přemysl Janouch <p@janouch.name>
  *
  * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
+ * purpose with or without fee is hereby granted.
  *
  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

plugins/lua-loader.c

@@ -1,11 +1,10 @@
 /*
  * lua-loader.c: Lua plugin loader plugin
  *
- * Copyright (c) 2015, Přemysl Janouch <p.janouch@gmail.com>
+ * Copyright (c) 2015, Přemysl Janouch <p@janouch.name>
  *
  * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
+ * purpose with or without fee is hereby granted.
  *
  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

plugins/mpd.lua

@@ -1,11 +1,10 @@
 --
 -- mpd.lua: Music Player Daemon service detection plugin
 --
--- Copyright (c) 2015, Přemysl Janouch <p.janouch@gmail.com>
+-- Copyright (c) 2015, Přemysl Janouch <p@janouch.name>
 --
 -- Permission to use, copy, modify, and/or distribute this software for any
--- purpose with or without fee is hereby granted, provided that the above
--- copyright notice and this permission notice appear in all copies.
+-- purpose with or without fee is hereby granted.
 --
 -- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 -- WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

plugins/nut.lua

@@ -1,11 +1,10 @@
 --
 -- nut.lua: Network UPS Tools service detection plugin
 --
--- Copyright (c) 2017, Přemysl Janouch <p.janouch@gmail.com>
+-- Copyright (c) 2017, Přemysl Janouch <p@janouch.name>
 --
 -- Permission to use, copy, modify, and/or distribute this software for any
--- purpose with or without fee is hereby granted, provided that the above
--- copyright notice and this permission notice appear in all copies.
+-- purpose with or without fee is hereby granted.
 --
 -- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 -- WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

plugins/socks.lua

@@ -1,11 +1,10 @@
 --
 -- socks.lua: SOCKS service detection plugin
 --
--- Copyright (c) 2015, Přemysl Janouch <p.janouch@gmail.com>
+-- Copyright (c) 2015, Přemysl Janouch <p@janouch.name>
 --
 -- Permission to use, copy, modify, and/or distribute this software for any
--- purpose with or without fee is hereby granted, provided that the above
--- copyright notice and this permission notice appear in all copies.
+-- purpose with or without fee is hereby granted.
 --
 -- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 -- WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

plugins/ssh.c

@@ -1,11 +1,10 @@
 /*
  * ssh.c: SSH service detection plugin
  *
- * Copyright (c) 2014, Přemysl Janouch <p.janouch@gmail.com>
+ * Copyright (c) 2014, Přemysl Janouch <p@janouch.name>
  *
  * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
+ * purpose with or without fee is hereby granted.
  *
  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF