Hopefully the last major script reorganization.

- policy/ renamed to scripts/

- By default BROPATH now contains:
	- scripts/
	- scripts/policy
	- scripts/site

- *Nearly* all tests pass.

- All of scripts/base/ is loaded by main.cc
	- Can be disabled by setting $BRO_NO_BASE_SCRIPTS
	- Scripts in scripts/base/ don't use relative path loading to ease use of BRO_NO_BASE_SCRIPTS (to copy and paste that script).

- The scripts in scripts/base/protocols/ only (or soon will only) do logging and state building.

- The scripts in scripts/base/frameworks/ add functionality without causing any additional overhead.

- All "detection" activity happens through scripts in scripts/policy/.

- Communications framework modified temporarily to need an environment variable to actually enable (ENABLE_COMMUNICATION=1)
	- This is so the communications framework can be loaded as part
	  of the base without causing trouble when it's not needed.
	- This will be removed once a resolution to ticket #540 is reached.

scripts/base/frameworks/metrics/http-example.bro

@@ -0,0 +1,20 @@
+@load frameworks/metrics
+
+redef enum Metrics::ID += {
+	HTTP_REQUESTS_BY_STATUS_CODE,
+	HTTP_REQUESTS_BY_HOST,
+};
+
+event bro_init()
+	{
+	Metrics::configure(HTTP_REQUESTS_BY_STATUS_CODE, [$aggregation_mask=24, $break_interval=10secs]);
+	Metrics::configure(HTTP_REQUESTS_BY_HOST, [$break_interval=10secs]);
+	}
+
+event HTTP::log_http(rec: HTTP::Info)
+	{
+	if ( rec?$host )
+		Metrics::add_data(HTTP_REQUESTS_BY_HOST, [$index=rec$host], 1);
+	if ( rec?$status_code )
+		Metrics::add_data(HTTP_REQUESTS_BY_STATUS_CODE, [$host=rec$id$orig_h, $index=fmt("%d", rec$status_code)], 1);
+	}