unhelpful error message when keyword is capitalized

[derrell]

Issue by derrell
Fri Jul 11 13:02:14 2014
Originally opened as https://github.com/derrell/AppDeveloper/issues/50

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See test t070. An accidentally-uppercased keyword such as While is taken as an identifier (and possible function call), so the error message is meaningless. Possible improvement is to keep track of tokens that are mis-capitalizations of keywords, when the "Maybe you forgot a semicolon" message is to be displayed, check for one found, and show it as a possible error.