UnusedFormalParameter does not apply to compact() prefixed with a namespace

Also added tests for this. Their created in an old fashion - exactly as previous tests regarding compact() function
UnusedLocalVariable doest not applyt to compact() prefixed with a namespace
fixed tests - some of them din't use namespace
Merge branch 'fix-namespaced-compact' of https://github.com/radmen/phpmd into radmen-fix-namespaced-compact
Merge branch 'radmen-fix-namespaced-compact'
Refs #150 - Changes documented.