Proper site separation

[scott-t]

At the moment, while sites may share an install directory, things break badly for various modules for modules that change directory contents.

Example of this using gallery modules (set up for separate tables) would two try and store their two default galleries (the hidden ones) within the same sub-directory, along with any other galleries which share id. This may not be desired effect.

Possible solution is to create a "files" sort of subdirectory which all site-unique files should be contained in (within a folder to somehow split by site) yet somehow allow sharing when needed (eg, shared photo gallery).