fix Manifest#each_autobuild_package when called without a block
small refactoring
autoproj now requires 1.9.2 or later
use the normal dependency mechanism for build tools instead of #add_build_system_dependency
autolocate and autoproj-locate are the same, make the former call the latter
fix the horrible performance of autoproj-locate (and thus acd)

autoproj generates an installation manifest for a pretty long time
now, that can be used directly by autolocate instead of loading the
whole autoproj configuration
autoproj subcommands should not have the exec bit set
osdeps: issue a message when reinstalling gems
osdeps: remove unused variable
cache: modify autoproj-cache to a one-cache-per-repository scheme

Having a huge repository makes git really really damn slow.
cache: move caching to an ops class
cache: add progress information
cache: don't run git gc with --aggressive

It is really too costly in terms of memory usage
bootstrap: has been a separate command line tool for a while, remove leftovers
bootstrap: move into a separate ops class
bootstrap: provide the exact command line after a failure of "autoproj bootstrap"
build: move into an ops class
objectify configuration handling
ops: add to Tools a method to handle the --verbose and --debug options
ops: when updating the configuration, load initrb just before we load the manifest

The file might contain definitions needed to update the package sets