[IMP] Improve field tooltips in account,email_template,mail,mrp,project,...

Respected Sir,
                         I have modify field tooltips in following module's file.........

                         modified:   addons/account/account.py
	                 modified:   addons/account/wizard/account_report_common.py
	                 modified:   addons/account/wizard/account_vat.py
	                 modified:   addons/base_setup/res_config.py
	                 modified:   addons/email_template/email_template.py
	                 modified:   addons/mail/mail_alias.py
	                 modified:   addons/mail/mail_mail.py
	                 modified:   addons/mail/mail_message.py
	                 modified:   addons/mrp/mrp.py
	                 modified:   addons/project/project.py
	                 modified:   addons/sale_stock/sale_stock.py
	                 modified:   addons/stock/product.py
	                 modified:   openerp/addons/base/ir/ir_actions.py
	                 modified:   openerp/addons/base/ir/ir_cron.py
	                 modified:   openerp/addons/base/res/res_partner.py