improve the one found on
http://www.emacswiki.org/emacs/DelphiMode
1. support 'record', 'class' and 'interface' as level 1 menu
2. methods show as submenu of class
3. correctly jump to the impl. part (ignore interface part)
FIXME: currently not work if no 'interface/implementation'
keyword: emacs, delphi, freepascal, imenu, ecb
