Fix PR pkg/42990
* Lexically scoped local properties, i.e. properties that are only defined
inside a target, sequential block or similar environment.
* <import> can now import from any file- or URL-providing resource - this
includes <javaresource>.
* Various improvements to the directory scanning code that help with symbolic
link cycles (as can be found on MacOS X Java installations for example) and
improve scanning performance. For big directory trees the improvement is
dramatic.
* The way developers can extend Ant's property expansion algorithm has been
rewritten (breaking the older API) to be easier to use and be more powerful.
a new top level element extension-point allows build files to be extended
with custom targets more easily
* At the same time the if and unless attributes have been rewritten to do the
expected thing if applied to a property expansion (i.e. if="${foo}" will mean
"yes, do it" if ${foo} expands to true, in Ant 1.7.1 it would mean "no"
unless a property named "true" existed). This adds "testing conditions" as a
new use-case to property expansion.
* Ant now requires Java 1.4 or later
* new task include provides an alternative to <import> that should be preferred
when you don't want to override any targets
* numerous bug fixes and improvements as documented in Bugzilla and in WHATSNEW
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