deleted readvp2.pro --unclear what it is supposed to do.
restored readvp2.pro from the repository --was needed after all
added a common block (its child functions need common variables); replaced the radar_ids with a call to READSTATIONLIST; removed the gifdir
replaced radar_ids with a call to READSTATIONLIST; changed the date range, otherwise the function will fail when using the testdata
added a directory separator to the directory, otherwise you get the wrong directory
edited the common block, it now only refers to the variables that are loaded by its parent
added a common block; added a directory separator to the url, otherwise IDL will look in a non-existent directory; changed the date, otherwise the function will fail on testdata; removed the FIXME about the psfile url, that's been fixed with a call to IDL_ENRAM_VISUALIZATION_OUTPUT.; added the subdir to the psfile name, such that you what settings were sed to create it afterwards.