Changeset 7143

#1661: Refactored some bits in the SymbolicExpressionTreeLengthAnalyzer. It now works with GA and it mostly works with OSGA, short of an interesting bug that I couldn't yet track down.

The bug occurs in the following situation:

• Using OSGA with the SymbolicExpressionTreeLengthAnalyzer turned on
• Everything works until the user wants to see the graphical histogram
• During the update of the bar chart/histogram, at some point the chart throws an overflow exception (possible overflow by zero or related). The exception is followed by a long stack trace involving WinForms and the Graphics system.
• The user can click continue and run again (if the histogram is not displayed then everything is fine)