copytool

WIP; adding options to preserve file/directory permissions, owner, and
group.

Change "disable-log" option to "enable-log" and make the log disabled by
default. Also add a warning if unsupported directory entries are
detected while copying. Version: v0.2.1.

Add progress bar; version: 0.2.0.

Fix bug where files were not being closed; v0.1.1.

First mostly functional version; let's call it v0.1.0.

Work in progress.

Initial commit with project skeleton.