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
move handling of autoproj internal configuration to the Configuration class

It was all over the place, and now that we have a Configuration class
there is really no point leaving it all over the place.