Added AJAX call to get subsystem list.
-ININ.
Added getSubsystemByProduct to fetch subsystem base on product ID.
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Added buildSubsystemListItems to create subsystem list items.
-ININ.
Queries for getProductList and getSubsystemByProduct in SearchService.
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Added divs to fill list items retrieved from AJAX calls.
-ININ.
Added subsystemAction to respond to AJAX calls for subsystem list items.
-ININ.