[FIX] account: CoA installer: include parent charts when determining default taxes, otherwise they cannot be set during install
[FIX] account_voucher, product, stock: use selection widgets for magic context fields, to pass IDs in the context instead of strings

Many2one fields resolve to strings when used
as `self` within the @context or @filter_domain
attributes of a search field, because they
must be able to support partial matches,
e.g. search for "Sto" to match "Stock".
In many case the code was not prepared to accept
string for the magic context values, so the
magic fields now caused crashes.

The widget="selection" attribute was dropped
during the search view cleanup for 7.0,
without noticing this unfortunate side-effect,
at revision:
  addons 7.0 revno 7142 revid:qdp-launchpad@openerp.com-20120731150358-jqd3eoz06imzlx01
[MERGE] account: CoA installer: include parent charts when determining default taxes, otherwise they cannot be set during install

See comments on this MP for some background:
  https://code.launchpad.net/~pedro.baeza/openobject-addons/7.0-updated_l10n_es/+merge/161654
[MERGE] account_voucher, product, stock: use selection widgets for magic context fields, to pass IDs in the context instead of strings

Many2one fields resolve to strings when used
as `self` within the @context or @filter_domain
attributes of a search field, because they
must be able to support partial matches,
e.g. search for "Sto" to match "Stock".
In many case the code was not prepared to accept
string for the magic context values, so the
magic fields now caused crashes.

The widget="selection" attribute was dropped
during the search view cleanup for 7.0,
without noticing this unfortunate side-effect,
at revision:
  addons 7.0 revno 7142 revid:qdp-launchpad@openerp.com-20120731150358-jqd3eoz06imzlx01