databases/cego,devel/lfcbase: 2.52.2 -> 2.52.4, 1.21.3 -> 1.21.6

lfcbase:

• To support several keyboard layouts, changed some window control sequences from Cntrl-Key to ESC key
• Added virtual method hasData to Pager class. The method must be implemented to indicate, if an execution returns a result set. If no result set is returned, just a message box is shown and edit mode is left ). This seems to be useful for DML queries ( insert, udate, delete, create, drop, ...)
• In Pager class, added buffer scrolling in editor part. Preparation started for Pager command history management
• Added history feature to Pager class. Command history can be loaded and saved with readHistory and writeHistory methods. Navigation through command history in Edit mode with Cntrl-P and Cntrl-N

cego:

• Adaptions made for pager and pager history feature