V160 use defined paths during install

Updated installer files with the following goals:
* Use filesystem paths for logs, cache, and pub if defined in /zc_install/includes/localConfig.php
* Use filesystem paths logs, cache, and pub during an upgrade if defined in the store configuration file
* Remove hardcoded references to the log folder and replace with DEBUG_LOG_FOLDER
* Reduce the number of warnings during installation by disabling warnings which do not directly impact the installation