Share 'Bug in Val() with Floats and fix for it'

Hi everyone, esp Allan. I just have fixed a rare bug that occurs when using Val() to an Extended type with 30+ digits. This bug occured only when truncating this value to a 64-bit integer. NDN's internal 64-bit calculator has showed this, and thanks to the help of a helper named CandyMan I was able to fix the bug in the VP RTL. I have written a test program to show the problem and also have add…