[QOF->GObject] Commited r15578: Work on GncAccount

[Daniel Espinosa]

Message:
"Begin Work on GncAccount object. Modifications (for now) to:
QofInstance, QofBook, QofBackend"

Notes:

The work to ensure the correct construction and destruction of
objects, have made to work back to QofInstance, QofBook and
QofBackend, becouse the way QOF work on begin_edit/commit_edit, this
work isn't finished yet.

Take note that most of the code in QOF has been modified for a long
time (and some times apear to be unmaintaned) and have a lot of
deprecated functions, direct access to variables in the object's
parent; this work will find most of this *not allowed* methods and
modified.

-- 
Trabajar, la mejor arma para tu superación
"de grano en grano, se hace la arena" (R) (entrámite, pero para los
cuates: LIBRE)