change the parameter name in constructors
support '+' and '-' in atom type name;clean the code a little bit
clean up SimInfo; modify the images of SelectionExpression.html
selection library is working
half of the selection utility is working need to debug within keyword and atomproperty keyword
more work in selection library
selection library in progress, except SelectionEvaluator, other files are compiled
Selection in progress
adding selection library
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