Merge remote-tracking branch 'origin/topic/documentation'

I'm merging in the documentation branch to avoid that it keeps getting
out of sync. We still need to work on this a bit more, I'll summarize
in a mail.

* origin/topic/documentation: (68 commits)
  Going over initial parts of the scripting overview.
  Adding lines in scripting/index.txt. No other change.
  Updating submodule.
  Pass over the Using Bro section.
  Applying doc updates from BIT-1063. (Anthony Verez)
  Breaking lines in using/*.
  More doc reorg, and a light pass over the first 3 sections.
  Starting to put a new structure in place.
  Updating submodule(s).
  Updating submodule(s).
  Adding some temporary testing/demonstration to front page.
  Switching btest to topic/robin/parts branch.
  Basic cross-referencing UIDs between files, btests, and baselines.
  A truly embarassing number of spelling corrections.
  Using redirection with bro-cut.  Include initial btests for this document.
  Corrected a mis-typed RST include.
  Initial start for "Using Bro".
  Spelling corrections.
  Include Notice Policy shortcuts in the Scripting User Manual.
  Notice::policy hooks and tests.
  ...

Conflicts:
	src/3rdparty

testing/btest/Baseline/doc.sphinx.include-scripts_base_init-bare_bro/.Users.robin.bro.docs.testing.btest..tmp.doc.sphinx.include-scripts_base_init-bare_bro.include-scripts_base_init-bare_bro.btest

@@ -0,0 +1,7 @@
+# @TEST-EXEC: btest-diff %INPUT
+
+-- init-bare.bro
+
+type string_array: table[count] of string;
+type string_set: set[string];
+type addr_set: set[addr];

testing/btest/Baseline/doc.sphinx.include-scripts_base_init-bare_bro/.home.robin.bro.master.testing.btest..tmp.doc.sphinx.include-scripts_base_init-bare_bro.include-scripts_base_init-bare_bro.btest

@@ -0,0 +1,7 @@
+# @TEST-EXEC: btest-diff %INPUT
+
+-- init-bare.bro
+
+type string_array: table[count] of string;
+type string_set: set[string];
+type addr_set: set[addr];