added test to assure that Properties::getCore() returns core copy and not a reference to it
elements array is made hidden in Content
Content::appendElem() append argument elements one by one, if it turns out to be a Content instance
index.php is cleaned from garbage
dumb
space is added
space is removed
in the middle of hiding private properties
Content::clone() does not exclude now objects that have no "clone" method
Classes and tests are modified wrt the fact that some properties became private
Refactoring Content class
Linkify method replaces shower in Link class
Comment-observation is added
docs
garbage removed
idr
Tag::contentFlush is added
Tag::setContent is added
List insertion
Garbage removed