One of the validity checks for a deck file is the total number of lines in the file. Initially I hardcoded this as 500 but have now added this as a setting in GeneralConfig to make it easier to update. Note, it can only be changed by editing the config file directly since I consider it to be an "internal" parameter - I don't think this warrants an entry in the preferences dialog.
rename Oracle filter to Search and add tooltip explaining what it searches.