imap-tests: Reset test folder.
prettyprint: @mrjbq7's funny word for . that doesn't limit the length of things.
images.loader.gtk: fix fall-through in case problem in image>GdkPixbuf
images.loader.tests: restructure the tests because the gtk linux backend doesn't handle some formats that the windows backend does
io.streams.peek: Add file position indicator api calls.
fuel.eval: wrap fuel-pprint in a without-limits so fuel output isn't truncated