[REM] account : Removed the default value for 'company_id' as it is already defined in 'analytic' module.
[REM]Removed account.period object and related stuff.

[REM]Removed stuff related to account.period from every where.

[IMP]changed period_date in to date_account.

[REM]Replaced period_id with date_account from reports and imporoved stuff.

[IMP]Improved some code for account.period is now removed.

[IMP]Improved code and removed access right of journal.period

[REM]Removed code related to account.period.

[FIX]Fixed traceback for company_id.

[FIX]Fixed traceback for context_today.

[FIX]Fixed traceback for context_today.

[FIX]Fixed traceback for invalid syntax for date type.

[FIX]Fixed traceback for invalid syntax for date type.

[IMP]Improved dateformt of date_account field.

[IMP]Improved dateformt of date_account field.