This renaming more intuitively expresses the relationship between
subprojects and the JAR artifacts they produce.

Tracking history across these renames is possible, but it requires
use of the --follow flag to `git log`, for example

    $ git log spring-aop/src/main/java/org/springframework/aop/Advisor.java

will show history up until the renaming event, where

    $ git log --follow spring-aop/src/main/java/org/springframework/aop/Advisor.java

will show history for all changes to the file, before and after the
renaming.

See http://chrisbeams.com/git-diff-across-renamed-directories

A subtle issue existed with the way we relied on isCurrentlyInCreation
to determine whether a @Bean method is being called by the container
or by user code.  This worked in most cases, but in the particular
scenario laid out by SPR-8080, this approach was no longer sufficient.

This change introduces a ThreadLocal that contains the factory method
currently being invoked by the container, such that enhanced @Bean
methods can check against it to see if they are being called by the
container or not.  If so, that is the cue that the user-defined @Bean
method implementation should be invoked in order to actually create
the bean for the first time.  If not, then the cached instance of
the already-created bean should be looked up and returned.

See ConfigurationClassPostConstructAndAutowiringTests for
reproduction cases and more detail.

Issue: SPR-8080

Branch in question is 'env' branch from git://git.springsource.org/sandbox/cbeams.git; merged into
git-svn repository with:

    git merge -s recursive -Xtheirs --no-commit env

No merge conflicts, but did need to

    git rm spring-build

prior to committing.

With this change, Spring 3.1.0 development is now happening on SVN
trunk. Further commits to the 3.0.x line will happen in an as-yet
uncreated SVN branch.  3.1.0 snapshots will be available
per the usual nightly CI build from trunk.

support for default "conversionService" bean in an ApplicationContext; revised formatting package, now integrated with DataBinder and AnnotationMethodHandlerAdapter; revised AccessControlContext access from BeanFactory

@Value values may use ${...} placeholders (driven by PropertyPlaceholderConfigurer); @Autowired uses field/parameter name as fallback qualifier value (SPR-5152)

EL container integration; support for contextual objects; removal of deprecated Spring 2.0 functionality; Java 5 code style