Fix bug in debugging variable list compilation with structure and array disabling

Fix bug with TRUNC function and with type conversion functions called with constant as parameter

Allow use of ENO keyword in structured variable field selector.

Fixing REAL_TO_INT conversion (behaved like a trunc and not like a round)

fixing INSERT function: was inserting into incorrect position. (submitted by Manuele)

Fix bug when generating integer with leading zero (octal value for C compiler)

Allow [EOL] after a label in IL.

Fix bug when using an enumerated or subrange type to define a structure element

Fix bug when declaring data type directly derived from array type

Fix conversion of binary digits to hex, when generating code.

Fix missing '(' when declaring new simple derived data type.

Ignore underscores in decimal integer constants when determining size in bits...

When checking semantics of expressions, skip semantic checking of data type definitions
(not yet supported). If we don't skip, all subsequent POUs would not be checked.

Fixing algorithm that determines bit size of constants containing underscores.

Merging with Edouard's version