Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)

Do constant folding of default initial values of datatypes.

Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.

When generating C code, use the const_value of a symbolic_variable when it is used in a subrange.

Small code re-organization of how const values are stored in symbol_c (can now be accessed through member functions, instead of macros)

Fix bugs introduced in previous commit (once again do constant folding of all literals in type declarations)

Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).

Delete un-used declaration.

merge

Allow variables to be used when declaring the dimension of an array.

Fix C code generation when forward references (-p command line option) is on.

Add a new pou_typename_c object to the AST to store references to previously declared Functions, FB, and Programs.

Delete unused file.

Make use of pre-parser a command line option.

Fix AST generated by parsing with preparsing switched OFF (typo in array datatypes, and fix parsing of POUs).

Fix AST generated by parsing with preparsing switched on, and allow parsing to work with preparsing off.

Fix bug introduced when adding support for relaxed datatype model: change derived_datatype_identifier_c to identifier_c when used as an identifier

Add a pre-parsing phase to stage1_2 (allows source code that references POUs and datatypes before they are declared)

Comment out unused and buggy code.

Update the comments in source code.

Fix bug introduced when adding support for relaxed datatype model. Code cleanup.

Fix main state machine in flex (states were being pushed without being poped from the stack)

merge

Make the relaxed datatype model a runtime option (off by default)

Add support for relaxed datatype model for array datatypes.

fix bug introduced a few commits ago: do not print the first char ('%') of a direct_variable_c (e.g. skip % in %IW4.2)

fix code generation when dereferencing pointers (ref_to) to arrays (ref_to_array^[5])

Fix bug: set the scope annotation in deref_operators used inside structs

Editing of error message to make it more clear.

Filling of symbol->scope annotation moved from narrow to fill_candidate_datatypes_c (became possible because narrowing of struct, array and symbolic variables is now done directly in fill_candidate_datatypes_c)

fill_candidate_datatypes_c now uses search_varinstance_decl_c instead of search_varfb_instance_type_c (moving towards deprecation of search_varfb_instance_type_c)

Do the full fill_candidate/narrow_datatype algorithm for all fields of a structured variable in the fill_candidate_datatypes_c
Allows us to remove temporary code from the search_varfb_decl_c