Insert #line directives in generated C code.

Add support for parsing of REF_TO keyword (defined in IEC61131-3 v3). This support is currently inactive (in flex) until we get to add C code generation later on.

Update files to be ignored by mercurial: ignore files generated by autoconf, directory test/, and *.orig

Fix bug: do not print IL 'label' when generating inline functions (JMPxx label was generating erroneous C code)

Add limited support for the REF() operator (defined in v3 of IEC 61131-3)

Remove assertion being failed by IL labels (IL labels do not yet have specific datatypes).

Added stage1_2/Makefile.am weird rule to keep compatible with previous version of automake

Merge

fix definition of pragma.

Fix the state machine that became broken 2 commits ago (when adding support for nested comments)

Add option to control support for nested comments (default is off, as defined in IEC 61131-3 v2)

Add support for nested comments

Fix bug: when checking compatibility between GLOBAL and EXTERNAL variables, must only enforce GLOBAL CONSTANT => EXTERNAL CONSTANT.
Reverse CONSTANT implication is not enforced, and neither is RETAIN compatibility.

merge

Fix bug: correctly generate code when accessing external variables declared inside FBs as a structured variable (realvar := fb1.fb2.extvar1.realvar)