Adding support for transition debugging

Added __DEBUG global var to eventually change PLC code execution

added missing includes on some platform (gentoo/gcc-4.3.1)

Some miscelanous static, extern and pointer status variable changes in C generated code for configuration and resources

Re-organized types headers, to ease debug code generation

Adding some improvements:
- columns in token location
- main parameter to allow user to display full location of errors
- parsing of errors in end of rules

Fixed generation of VARIABLES.csv, some variables appeared in program section

Fixed some uncatched errors and error bounds in error messages

Some bugs on syntax checking tests fixed

Updated tests so that they compile again :-)

Adding some human-readable error messages

Fixed missing return in XOR operator code gen.

removed __print statements. Not supposed to be in std lib.

Changed located global variable declaration and init to reflec recent change on located vars (pointers)

added some type handling tools in iec_std_lib. To be tested

*** empty log message ***

Modifying time qualifier in SFC to take real time enlapsed instead of theoric period time

Bug on __TIME_CMP fixed

Fixed some issues on:
- parsing string compare symbols
- retricting operation available on enumerated types

Support for extern pointer for located variables

Adding support for POU struct definition in POUS.h
Adding program instanciated in configuration definition into VARIABLE.h

Bug with D and L action qualifier and timing management in SFC generated fixed

Bug with C code generation for SFC when more than one sfc_network in one sequential_function_chart fixed

Problem with negated literals while compiling generated C file on 32bits systems fixed

Bug on located variables without name declaration fixed

Changing SFC Transitions, Steps and Actions types

Adding support to distinguish direct variables and pointed variables

cast fir gcc4 fix in lib