I have made a slight change to PSP regarding the include tag.
Previously, this tag caused the included file to be read in and stored
at PSP generation time, and any changes would not be incorporated
without regenerating the page. I have changed this so that the default
behavior is to read the file on every request. The old behavior is
available by specifiying "static="true"" in the tag.
I might add caching and file timestamp checking later.