Discrete dimension fixes, infrastructure improvement, changes:

Discrete dimension fixes, infrastructure improvement, changes:

1) Discrete dimensions upper/lower bounds quantize to the bin closest to the scale min and max; the upper scale bound is inclusive, not one past (ie, a discrete dimension with a scale of {1.,5.,10.} and a quant of 1 is specified to span [1, 10], not (1,10)

2) discrete dimensions are iterated monotonically from zero.  In the
above example, this means the objective sees 0,1,2,3,4,5,6,7,8,9.
Zero indexed monotonic applies only to objective iteration; this will
be configurable soon...

git-svn-id: http://svn.xiph.org/trunk@12303 0101bb08-14d6-0310-b084-bc0e0c8e3800