IDE: messages: menu item for open package

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45158 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: test compiler options: clear messages

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45159 4005530d-fff6-0310-9dd1-cebe43e6787f
LCL: docs

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45160 4005530d-fff6-0310-9dd1-cebe43e6787f