Correct read function to stop trimming of final character of user input#1

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Rufilla wants to merge 2 commits intomrfishie:masterfrom

Rufilla:master

Commits on Nov 12, 2016

Correct read function to stop trimming of final character of user input, correcting loss of final character during INPUT A$;PRINT A$
JoeNicholson
committed

Commits on Nov 13, 2016

Add SHELL command to allow BASIC to access the shell
JoeNicholson
committed