Now that the tests work in py2 or p3 we don't set py version in AP. This
allows for dealing with the AP images that don't have a way to set the
py version.
* project.jam (lookup-with-load): New rule.
(find-target): Try interperting target id as project first.
* build-request.jam (from-command-line): Don't grab
unconditionally elements which have slashes -- they may be target
ids.
* build-system.jam: Allow target ids is command
line. Accept --clean option.
* BoostBuild.py (run_build_system): Call 'ignore_directoies' on diff.
* tree.py (Trees_different.ignore_directoies): New method.
[SVN r15768]
* virtual-target.jam (virtual-target.actualize): Accept
'scanner' parameter and create different actual targets
for different values of that parameter.
(virtual-target.includes): Remove.
(binding): New rule
(remember-binding): New rule.
* type.jam (set-scanner): New rule. (get-scanner): New rule.
* scanner.jam: New file.
* class.jam (__init__): Define __name__ in class scopes.
* builtin.jam (c-scanner): New scanner class, associated with CPP
files.
[SVN r15644]
