[dev-context] Structure syntax for enumerations

[Aditya Mahajan]

Hi,

I will like to propose a new command, \definestructureenumeration, which 
is similar to \defineenumeration, but follows the conventions of 
\definestructuresection, that is, allows one to write

\definestructureenumeration[theorem]

\starttheorem[title={An important theorem}, list={Not so important}]
   ...
\stoptheorem

The \start<enumeration> command takes the same arguments as \startsection.

What do you think?

Aditya