syntax: Print suffixed token literals correctly

Previously, literals "1i" were printed as "1". This fixes the
numeric-method-autoexport test for pretty printing.
test: Give a test a bigger stack for pretty printing
syntax: Preserve attributes in #[deriving]

Now that the #[deriving] attribute is removed, the raw_pointers_deriving lint
was broken. This commit restores the lint by preserving lint attributes
across #[deriving] to the implementations and using #[automatically_derived] as
the trigger for activating the lint.
syntax: Improve --pretty normal slightly

When printing doc comments, always put a newline after them in a macro
invocation to ensure that a line-doc-comment doesn't consume remaining tokens on
the line.