Changed behavior for $phpwcms['js_lib'], it is now used to merge with defaults

When deprecated is activated the older libraries like jQuery 1.3 or MooTools are available again or extend the default values by using own definitions like `array('mootools-1.4'=>'MooTools 1.4')`
Match setup with changed behavior of $phpwcms['js_lib']
Remove -- comment lines from SQL
no need to have additional white spaces after `<!-- JS: … -->` `<!-- CSS: … -->`
Just one more `elseif`
Update date