Installation and Upgrade

During package installation or upgrade, this addon:

1. Copies common files from the concrete5 core into the block directories for the cache free versions of the Content and HTML blocks.
2. Replaces the block controllers with the cache free versions and adds further files and templates copied from the package's /installation/ directory.

The package controller also adjusts its own minor version number to enable a package upgrade following any core upgrade.

This should enable the block to self-upgrade with further concrete5.6 series releases, but may give issues when concrete5.7 makes substantial changes to the content block. Hence the package controller will throw an exception if any attempt is made to install or upgrade on a concrete5.7 site.