Plenty of changes

• Removed -add from a2enmod. Specify a path file to second parameter of a2enmod to add a new module.
• Any module file type can be added.
• Module can be added from any location.
• Added modules will have their LoadModule line appended to a block of such lines underneath a commented section titled "Dynamic Shared Object (DSO) Support".
• Use -copy to copy module file or .conf site to default folder. With a2ensite, -replace will replace the path to the module file in the LoadModule line in. With a2enmod, it will delete the .conf file in sites-available of the same name.