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Bugfixes:
* 'pack' no longer stop if a file is missing
* Do not attempt to pack files from /proc or /dev
* Stops vagrant without --use-chroot from overwriting files
* Downloads busybox instead of using the host's /bin/sh
* Correctly packs the dynamic linkers from the original machine
* The tracer no longer considers `execve()` to always happen before other accesses
* Fixes pytracer forking the Python process if the executable cannot be found
* Improves signal handling (but bugs might still exist with `SIGSTOP`)
* Fixes a bug if a process resumed before its creator (race condition)
Features:
* -v flag also controls C tracer's verbosity
* Detects (but doesn't handle yet) i386 compatibility and x32 mode on x86_64
* Stores working directories and exit codes of all processes in database
* Added `reprozip reset [-d dir]` to reset the configuration file from the database