Working experiment with problems

I think that I should modify my database to have this structure:
    $db Array
        $table Array
	    $columns
	    $data
	$table2 Array

	etc.
Correctly loads the Condition File

Fixes the massively confusing twists and turns that were made to load in
the condition file from a separate directory. Now uses a constructor to
pass the file location (default is DATA_FOLDER).

Commit also adds some files for the next step: selecting the condition,
loading the procedure and stimuli, and joining those into the trials table

Finally: minor naming convention fixes I noticed