#386 incomprehensive error message in float constants

[Rainer Müller]

If a floating point constant is written with a lower case 'e' the compiler emits the error message.
E.g. DCL f FLOAT INIT(1e3);

Syntax Error :extraneous input 'e3' expecting {')', ','}

It would be more comprehensive, if

• the lower case e would be accepted
• the error message would be like did you mean 1E3 ?

[Rainer Müller]

after discussion with marcel:

• the grammar becomes extended to accept lower and upper case (e/E)
• in case of lower case e (e) and -std=PEARL90 a warning should be emitted