writeConfigurationFile

Copy a configuration file from template, then rewrite with actual configuration values

Located at install\page_configsave.php

Parameters
`string[]`	`$vars`	config values	#
`string`	`$path`	directory path where files reside	#
`string`	`$sourceName`	template file name	#
`string`	`$fileName`	configuration file name	#

Returns
`true\|string`	true on success, error message on failure