AUI.Boot disk space (housekeeping)

[Alex2772]

We have a build machine with persisting AUI.Boot cache (~/.aui) which repeatedly runs out of disk space because of AUI's cache. Because we often update our dependencies' versions, the older ones are still kept, leading to the disk problem.

AUI.Boot should have at least an option to somehow figure out the problem.

We can add rm -rf ~/.aui to cron but it would break the running builds.

[Alex2772]

1. Copy the binaries that are required to the current build directory while file repo lock is active.
2. Cleanup only while repo lock is active.