Fix memory leaks. Make GUI faster and more user friendly.

=== dqm_display ===

Repaint histogram when windowActivate event is received (Serguei Kolos) Fix crash by clearing kCanDelete bit of TPolyMarker objects (Serguei Kolos) Fix a crash after configuration reload (Serguei Kolos) Dwongrade some internal messages from error to warning (Serguei Kolos) Redirect intrnal ERS messages to the Log table (Serguei Kolos) Send errors to ers::error (Serguei Kolos) Fix memory leak (Serguei Kolos) Code cleanup (Serguei Kolos) Adjust initial size of the docks. Save and restore logs and alarms column sizes. (Serguei Kolos) Restore the correct code that was accidentally broken (Serguei Kolos) Prevent dialog destruction when its system close button is pressed (Serguei Kolos) Add proper margins to rectangular item. (Serguei Kolos) Parameter name spans both columns in the text view table. (Serguei Kolos) Remove unnecessary code. Improve text painting in zoom mode. (Serguei Kolos) Remove unnecessary code. Improve text painting in zoom mode. (Serguei Kolos) Remove unnecessary code. Improve text painting in zoom mode. (Serguei Kolos) Remove unnecessary code. Improve text painting in zoom mode. (Serguei Kolos) Remove unnecessary code. Improve text painting in zoom mode. (Serguei Kolos) Use Z order to impreve selection drawing. Improve item visibility detection (Serguei Kolos) Fix background color for the Lock button tooltip (Serguei Kolos) Replace AutoScale checkbox with FitToView button (Serguei Kolos) Fix crash in Find dialog after configuration reload. Keep scale when selecting children of the same parent. (Serguei Kolos) Improve back/forward navigation (Serguei Kolos) Umprove level up navigation (Serguei Kolos) Replace WA_TranslucentBackground with WA_NoSystemBackground as the former stopped working - overlay window was not painted (Serguei Kolos) Fix segmentation fault due to deleted graphics effect after data reload. (Serguei Kolos) Code cleanup (Serguei Kolos) Update details view when divide by reference state changes (Serguei Kolos) Add item name to tooltip. (Serguei Kolos) If layout is not defined then create a default one that can accomodate all existing children (Serguei Kolos) Fix tooltip background color. Improve Regions summary HTML text. Save parameter dock splitter position. (Serguei Kolos) Draw selection in Graphics View. Select nested nodes with tansparent parents. (Serguei Kolos) Subscribe to IS only when GUI widgets are ready to accomodate IS callbacks (Serguei Kolos) Add histogram lock/unlock button (Serguei Kolos) Fix updates of items in the central view when a new DQ result is produced. (Serguei Kolos) Update 'histogram not found' TPaveText attributes (Serguei Kolos) Check return value of TH1->Divide() function (Serguei Kolos) Change the main wndow layout - histogram widget is always shown next to the main view (Serguei Kolos) Use gradient for shadow drawing (Serguei Kolos) Add possibility to resize font (Serguei Kolos) Downgrade log messages to debug (Serguei Kolos) Use a single TCanvas to create histogram images. (Serguei Kolos) Use a single TCanvas object to draw histograms (Serguei Kolos) Show wait cursor when painting histograms (Serguei Kolos) Don't use Qt private includes (Serguei Kolos) Release QImage data using Qt internal headers (Serguei Kolos) Split Histogram to Histogram and HistograWidget classes (Serguei Kolos) Split Histogram to Histogram and HistograWidget classes (Serguei Kolos)