clean up:

- unused `:display` chunk option
- rm `displayed` chunk field
- rm `cur_result`, `pendind_code`, `term_state` `Report` field
- rm `:skip` config option
- rm unfunctional `include` chunk option for now

src/config.jl

@@ -1,9 +1,9 @@
+# TODO: follow RMarkdown convention more
 const _DEFAULT_PARAMS = Dict{Symbol,Any}(
     :echo => true,
     :results => "markup",
     :hold => false,
     :fig => true,
-    :include => true,
     :eval => true,
     :tangle => true,
     :cache => false,
@@ -18,7 +18,6 @@ const _DEFAULT_PARAMS = Dict{Symbol,Any}(
     :label => nothing,
     :wrap => true,
     :line_width => 75,
-    :engine => "julia",
     :fig_ext => nothing,
     :fig_pos => nothing,
     :fig_env => nothing,

src/rendering/common.jl

@@ -91,9 +91,7 @@ function format_chunk(chunk::CodeChunk, docformat)
 
     # Handle figures
     if chunk.options[:fig] && length(chunk.figures) > 0
-        if chunk.options[:include]
-            result *= formatfigures(chunk, docformat)
-        end
+        result *= formatfigures(chunk, docformat)
     end
 
     return result