Revert Linas' broken changes to qof.

[Derek Atkins]

Log Message:
-----------
Revert Linas' broken changes to qof.

	* src/engine/Transaction.c: fix a comment to better explain why
	  we have no-op functions for some parameters.
	* src/engine/qof*:  Revert Linas' patch from last night which
	  is broken is way too many ways to count.  First, the code didn't
	  compile.  Second it was calling functions that took one argument
	  with two due to broken casting.  Third, it had repurcusions in
	  other sections of the code that Linas needs to take into account.

Modified Files:
--------------
    gnucash:
        ChangeLog
    gnucash/src/engine:
        Transaction.c
        qofclass.h
        qofquery.c
        qofquerycore-p.h
        qofquerycore.c
        qofquerycore.h