Create an unversioned copy of a tree.
usage: 1. export [-r REV] URL[@PEGREV] [PATH]
2. export [-r REV] PATH1[@PEGREV] [PATH2]
1. Exports a clean directory tree from the repository specified by
URL, at revision REV if it is given, otherwise at HEAD, into
PATH. If PATH is omitted, the last component of the URL is used
for the local directory name.
2. Exports a clean directory tree from the working copy specified by
PATH1, at revision REV if it is given, otherwise at WORKING, into
PATH2. If PATH2 is omitted, the last component of the PATH1 is used
for the local directory name. If REV is not specified, all local
changes will be preserved. Files not under version control will
not be copied.
If specified, PEGREV determines in which revision the target is first
looked up.
