Locale-sensitive, self-denominating Bitcoin value formatter/parser

I had created this class for myself, but with just a bit of modification it seems worth sharing.  If you fancy making it part of bitcoinj, you're welcome to it.  If not, no hard feelings.

There is javadoc documentation in the comments, but briefly, while it overlaps partially with the `CoinFormat` class, the major differences are:

3. When formatting, it adjusts the denominational units so as to minimize the number of zeros in the formatted number and adds a currency symbol or code to indicate the units;
2. The number formatting and placement of the currency symbol/code is locale sensitive; and
1. It extends the `java.text.Format` class, which allows for the type of examination and manipulation of the different fields in the format--such as integer, fraction and decimal separator--that is necessary if you need to do things such as aligning a list of numbers vertically.
To the extent there's any difference, the one on the right looks more legible to me.  In the one on the left, the vertical bar is off-center and intersects with the right-end of the middle-horizontal line of the "B".  I expect that would not be consistent across all typefaces.

Other than that, I'm not grasping why, in any given context, a reader would be at any greater or lesser risk of mistaking one but not the other for the symbol of the national currency of Thailand.