Gives more accurate error propagation, control of depth of recursion
and short circuit recursion where possible.
Most of the the heavy lifting is done in the "fs" package, making file
system implementations a bit simpler.
This commit contains some code originally by Klaus Post.
Fixes#316
This means you can mix `--include` and `--include-from` with the
other filters (eg `--exclude`) but you must include all the files you
want in the include statement.
Fixes#280
* Implement include/exclude
* Implement rsync compatible file globbing
* Implement command line filtering flags
* --delete-excluded - Delete files on dest excluded from sync
* --filter - Add a file-filtering rule
* --filter-from - Read filtering patterns from a file
* --exclude - Exclude files matching pattern
* --exclude-from - Read exclude patterns from file
* --include - Include files matching pattern
* --include-from - Read include patterns from file
* --files-from - Read list of source-file nam
* --min-size - Don't transfer any file smaller than this in k or suffix k|M|G
* --max-size - Don't transfer any file larger than this in k or suffix k|M|G
* Document
