joomla/joomla-platform — pull request #1386 by mbabker (2012-07-18 22:26:53+00:00)
Title: Improvements to install adapters

- Restored preflight method to plugin uninstall per @pasamio comments at https://github.com/joomla/joomla-platform/pull/1343#issuecomment-6798887
- Added check to package adapter install method to determine whether to use install or update route; subsequently changed later JInstaller::install trigger to use the route information
- Document class vars in template adapter
- Remove check for install root tag in JInstallerHelper::detectType()
- Deprecate JInstallerHelper::splitSql() in favor of JDatabaseDriver::splitSql() (which the deprecated method already proxies to)