Repository features progress, and other Appdapter project news

[stub22]

This morning's commit (trunk version 254) includes stronger equivalence of Repos across
different backing stores (spreadsheets and SDB-SQL).  This equivalence now allows us
to run copy operations across Repo subtypes, which is fundamental to our strategy.

Our current maven builds target the following versions of the Jena + ARQ + SDB software,
// Currently we're on   Jena 2.6.4, ARQ 2.8.7, SDB 1.3.4

We continue to target JDK 1.6 (rather than 1.7), to maintain our Android compatbility until
the next move in Google-Oracle chess.

We continue using Scala 2.8.1, although an upgrade to Scala 2.9.x is warranted when
we can afford it.  One interesting thing we learned recently is that Scalac multicore
compilation under maven is much faster when using  the -XX:+TieredCompilation,
VM flag for java (since about JDK6-update-25?).   Do you like faster?  Whoopee!

There are numerous newer docs available in an "OpenSrc" folder on Google Docs(/Drive),
which includes a subfolder for Appdapter.  To see an example of Appdapter being used,
have a look at Cogchar.

http://tinyurl.com/cag28je

Our latest Java-side source code is available for browsing here:

https://www.assembla.com/code/appdapter/subversion/nodes/trunk/src_java/org/appdapter

and our latest Scala code is here:

https://www.assembla.com/code/appdapter/subversion/nodes/trunk/src_scala/org/appdapter

I haven't been keeping much track of who is using Appdapter so far (other than projects
I am directly involved in), so I'd love to hear about anything you are doing with it.