ReadMe tweaking. Simplify. Add References and links.

doc/Features.md

@@ -1,3 +1,5 @@
+#### (Work in progress)
+
 The following Oberon types are independent of compiler size:
 
 | Types          | Size   |

doc/History.md

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+#### (Work in progress)
+
+
+
 ### History
 
 

doc/Installation.md

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+#### (Work in progress)
+
+
 ## TODO
  - Organise into summary and per-platfrom sections
    - with subsections for linux and BSD variants

doc/Porting.md

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+#### (Work in progress)
+
 ### Porting to a new platform
 
 Porting to a new 32 or 64 bits platform is usually automatically handled

doc/Roadmap.md

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+#### (Work in progress)
+
 #### Machine size issues
 
 I don't see any really good solutions to different machine sizes. Existing code,
@@ -83,3 +85,8 @@ address. It would be quite a lot of work!
  - CASE statements only support INTEGER (with low positive values) and CHAR.
  - Reject LOOP statements.
  - All imported variables are read-only.
+
+#### To be left out?
+
+Work on other compatibility layers is in progress.
+voc team also works on bindings to existing C/Pascal libraries.