Categories table definition and rows

from http://unstats.un.org/unsd/cr/registry/regcst.asp?Cl=27&Lg=1
* Sections are Categories
 * plus an "Other" category
* Divisions with Sections are the Subcategories
 * plus an "Other" subcategory
to match existing https://github.com/mastercoin-MSC/omniwallet/blob/master/var/lib/omniwallet/www/categories.json