2014.4
 * Version 2.1 (Rev.1)
 * Add Auto/Manual button for Inxx Width in GUI dialog.

2014.2
 * Version 2.1
 * upgrade input sources from 16 to 32.

2014.1:
 * Version 2.0
 * Version 1.0 of the xlconcat block reverses the order in 
 * which input signals are concatenated. Version 2.0
 * preserves the order of input signals on the output.
 * The upgrade from 1.0 to 2.0 will change input connections
 * in order to preserve the overall the signal order on output.


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