[AgileWiki] table contents cache working, simple ledger rewritten

[Bill la F. <bil...@su...>]

Sougata and all,

With the old API, the SimpleLedger code was quite verbose. But by fixing 
the table content cache, making it a smart wirte cache, and by having a 
custom display that handles the running totals rather than having the 
running totals in the table itself, things have shrunk nicely.

I will need to document this stuff. One change is the new deploy command 
which creates the descriptor unit. Ah! We no longer need to create a new 
database for each new application! :-) (But note that you need to be in 
the DescriptorUnit for the deploy command to be applicable.)

Another aspect is that the crSimpleAccounting command now requires the 
SimpleAccountingDescriptorUnit to be present for it to be applicable. So 
the application does not run in cabinets where you have not deployed its 
descriptor units.

Still need to add the accountEntry command. Then it will be rude, crude, 
but still a usable accounting system. :-)

Now I'm thinking that once the documentation is done for the application 
platform, we can declare that we have achieved 3.1. That will make it a 
bad wiki that is also a reasonable application platform. A bit odd, what?

Bill