Start data type checking of var declarations (including direct variables!)

Delete incorrect comments I had inserted previously (confusing EQ and NE functions)

merging with Lauren't changeset.

merge with Laurent's changeset (essentially ignore all changes).

merge with Laurent's changeset (essentially, ignore all changes).

merging with Laurent's changes.

merging with Laurent's change.

merging with Laurent's revision 55b074ea7255 (essentially ignoring all changes)

Add coment warning about incorrect implementation of the NE standard function.

merging with Laurent's patch.

Print correct error message when handling IL function calls.

Edit error message.

Add EXPT widen table.

Some stupid code cleanups.

Some code cleanups.

Clean up the code.

Fix error messages of il function calls - it now prints out location info of first parameter.

Clean code for printing errors in expressions.

Clean code for comparison operations & operators.

Cleaning up XORN, ANDN, and ORN operator code.

Cleaning up some code.

Add 'widen' tables for AND, OR and XOR operations.

Add MOD widening table, and some code clean-ups.

Re-organizing the code.

Change setting of deprecated_operation from fill to narrow_candidate_datatypes_c.
Expand widening tables for ADD, SUB, MUL and DIV.

Clarify some details in the comments.

Add check widening status for IL operator.
Fix check widening status for ST expression.

Fix remaining 'widen' tables.

Fix some 'widen' table entries.

Add a TODO comment.