'remove_tree()' can cooperate with 'mkpath()' in the maintenance of
the PATH_CREATED cache: specifically, if a directory is created
with 'mkpath()', later removed with 'remove_tree()', and 'mkpath()'
is again requested to create it, then it would erroneously think
the directory already existed, because it was in the PATH_CREATED
cache. The patch (slightly tweaked by me) fixes that.
- file_util.py: operations on single files
- dir_util.py: operations on whole directories or directory trees
- dep_util.py: simple timestamp-based dependency analysis
- archive_util.py: creation of archive (tar, zip, ...) files
The functions left in util.py are miscellany that don't fit in any of the
new files.
