updatetin compiler warnings and documentation strings

Signed-off-by: Ralf Zerres <ralf.zerres@networkx.de>

src/lib.rs

@@ -5,23 +5,24 @@
  * SPDX-License-Identifier: (0BSD or MIT)
  */
 
-#![warn(missing_docs, rust_2018_idioms, rust_2018_compatibility)]
+#![warn(missing_debug_implementation, missing_docs, rust_2018_compatibility, rust_2018_idioms)]
 #![recursion_limit="256"]
 
 #![warn(clippy::pedantic)]
 //#![warn(clippy::nursery)]
 
 //! advotracker database
+//!
 //! Supports lawyers to capture relevant data encountered during an
-//! online legal advice.
-//! This SQL database backend will consuming Diesel to make use of
-//! sql features.
+//! online legal advice.  This crate handles all database
+//! communication. It uses diesel-async and diesel to convert rust
+//! structures to create sql queries (ORM). r2d2 is used to manage and
+//! utilize a connection pool.
 
-// ?? is this needed in edition 2018 anymore ??
 #[macro_use]
 extern crate diesel;
 
-/// SQL functions and methods
+/// SQL functions
 pub mod functions;
 
 /// SQL models definitions