Debugging helper class: print value of tokens in debugging output.

Fix bug: allow global variables of type DT (initial values for DT are not const!)

Add comment stating how to enable debug option in flex.

merge

Print error message when FB/Struct initial value contains other strcuts/FB/arrays (not yet supported by C code generator).

Do datatype checking of initial values for structures and FBs, and print error messages when compiling erroneuos source code.

fix bug in symbol_c::find_element()

Acceept structure_element_declaration_c symbol as a possible (non base type) data type

Add token references in structure_element_declaration_c

Add token reference to all symbol_c, and add list_c::find_element()

remove debug code left in by mistake in previous commit

Access elements[] in list_c through a new get_element() method.

Start implementation of datatype checking of initial values for structures and FBs.

fix wrong common_ticktime if task interval is greater than 4.3 seconds

Allow use of GLOBAL/EXTERNAL variables as control variable of FOR loop.

Start adding support for explicit initialization of FB instances. Currently only allows initializing FB variables of elementary types.

merge

merge

merge

Fix date conversion function (seconds to Date_and_Time). First day of month was falling on previous month.

Fix error locations messed up in previous commit.

fix compilation of SFC transitions written in IL (compiler was entering endless loop)

fix SFC timed qualifier (D, L, ...) with variable time (was generating wrong C code)

Fix segmentation fault bug introduced by previous commit

Correcty determine the datatype (TIME) of the parameters of SFC actions with timed qualifiers

Check that flex is installed during ./configure

Fix code generation for XOR expressions in ST (add parenthesis)

merge