make autoproj build a separate command as well
remove obsolete subcommands from CmdLine

It both removes the subcommands that have their own script, as well
as the ones that are now obsolete

Obsoleted:
  - fast-build and full-build: fast-build is the default and full-build
    can simply be done with update and then build
  - rebuild is now build --rebuild
  - force-build is now build --force
  - update-config is aup autoproj/
cli/update: add the --config option
cli/update: the paths given to --from should be expanded from PWD, not ROOT_DIR
cli/update: minor cleanup
use the latest automake in 'autotools'

Let the user define and install an older one if needed
start migration to the thor-based CLI implementation

This commit migrates build, update and show. The other subcommands
remain available but need to be explicitely called with the dash
(i.e. autoproj-locate)
remove obsolete autoproj-list command (superseded by show)
add the status subcommand