This also makes it clearer the command was executed succesfully.
Times are now printed with no more then two decimals. This prevents confusion
between thousand and decimal seperators.
Query window has now buttons with icons made in the designer for better looks.
Depending on received responses from the database the tabcontrol with the message, data and explain tab
now switches to the appropriate tab.
Uses json format with jsoncpp as a parser. Then show it in a QTreeView.
Shows inclusive/exclusive times like explain.despesz does. Also a similar
coloring scheme as applied.
