Consistent behavior of GetRandom{numeric}

[fluffynuts]

GetRandom{Int|Long|Decimal|Float|Double) should be friendlier when providing only a lower-bound for the range of acceptable values, and, instead of using the default parameter value and then potentially swapping them, should rather use the default range, added onto the minimum

ie if the user asks for GetRandomInt(100), then she probably expects a number of value at least 100, but the current implementation defaults the max to 10 and tries to protect the caller against accidental flipping of min & max, so the call above results in a number between 10 and 100 (inclusive). Probably not the original intention of the call, and not clear.