[imp] account, base_setup: move chart of accounts selection from base_setup installer to account's

Also remove it from account's config item as it's redundant

Rationale: account can be installed due to dependency chains, not just
direct installation from base_setup: project, stock, purchase and
profile_auction all depend on account, mrp depends on stock which
depends on account, so from base_setup's installer alone there are 5
different ways to end up with account installed and need to configure
charts of accounts.

Therefore having chart of accounts config in base_setup's installer is
dumb (as we need a second one anyway), and since it's (in a way) a
problem of module installation, the most coherent way is to move it to
account/installer.py, and remove it from the config screen where it
was (which becomes redundant).

Made it required, because it was required in the config item, not sure
it's actually mandatory to install a chart of accounts but whatever.

bzr revid: xmo@tinyerp.com-20100126140830-h4c7hlvmzzos69ls

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