Improve panic messaging and process behavior.

- Replaced main() to use custom panic hook
- Updated log formatting
- Switched to panic=abort, since we don't need to unwind now.
- Process will now abort if any thread panics.

Cargo.toml

@@ -15,6 +15,12 @@ exclude = [
     "/test-projects/**",
 ]
 
+[profile.dev]
+panic = "abort"
+
+[profile.release]
+panic = "abort"
+
 [features]
 default = []
 
@@ -56,6 +62,7 @@ harness = false
 
 [dependencies]
 memofs = { version = "0.1.0", path = "memofs" }
+backtrace = "0.3"
 
 crossbeam-channel = "0.4.0"
 csv = "1.1.1"