Remove duplicated documentation from SConstruct file.
Indent the additional notes to better match the other usage output, add a sentence about installing multiple versions.
Merge pull request #40 from mikepurvis/doc-dedup

Doc deduplication in SConstruct
bug fix in port setters
updated comment
Merge branch 'master' of github.com:andysworkshop/stm32plus
Merge pull request #1 from andysworkshop/master

test