[IMP] account_asset_management: more tests (test_4 failing)

test_4 is failing as it is a scenario of having an init_entry
depreciation line in an active fiscal year. Next commits intend to
fix this.
[IMP] account_asset_management: support moves with more than one asset depreciaion in the same move

Such moves are not generated by the module itself but may
exist when importing existing moves from another system.
This patch should otherwise not change the behaviour of the module.
[FIX] account_asset_management: support init entries in current fy

Fixes test_4. Handle situations where we have depreciation init entries
in the same fiscal year as real depreciation lines.
[IMP] account_asset_management: simplify adjustment queries

Use depreciation lines instead of account moves since
there are now checks that ensure both are synchronised.
Merge branch 'acsone-7.0-asset-management-fix3-sbi' into 7.0