Add dbg profile to Cargo; default to faster builds accomodating new users.

Cargo.toml

@@ -723,7 +723,7 @@ strip = false
 # and can be raised if build times are tolerable.
 
 [profile.dev]
-debug = "full"
+debug = 0
 #rustflags = [
 #	'--cfg', 'tuwunel_mods',
 #	'-Ztime-passes',
@@ -783,7 +783,7 @@ inherits = "dev"
 
 [profile.dev.package.'*']
 inherits = "dev"
-debug = "limited"
+debug = 0
 incremental = false
 codegen-units = 1
 opt-level = 'z'
@@ -800,6 +800,11 @@ opt-level = 'z'
 #	'-Clink-arg=-Wl,-z,nodelete',
 #]
 
+# same as dev but slower.
+[profile.dbg]
+inherits = "dev"
+debug = "full"
+
 # primarily used for CI
 [profile.test]
 debug = "limited"