Logging for headerlet does not release log file handle

[stsci-hack]

This module defines a FileHandler for the logging in the current working directory for the user when this module first gets imported. If that directory is removed later by the user, it will cause an Exception when performing headerlet operations later in another directory.

By itself, this is a relatively rare occurrence during use of this code. However, this code relies on use of a decorator which may not be necessary given what Python's logging module can do.

[mcara]

What is this about? There is no code to look at...