Re-jigged the class implementation to get better support from roxygen2 and CRAN check(). Majority of public functions are documented (remaining are the CRUD functions)

man/DBClient-cash-getConnection.Rd

@@ -0,0 +1,8 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/DBClient-Initialize.R
+\name{DBClient$getConnection}
+\alias{DBClient$getConnection}
+\title{DBClient$getConnection}
+\description{
+Returns the DBConnection instance for this client
+}