view and template for reports, some changes in models, view booking archive

biscuit/apps/fibu/forms.py

biscuit/apps/fibu/models.py

biscuit/apps/fibu/templates/fibu/account/index.html

biscuit/apps/fibu/templates/fibu/booking/book.html

biscuit/apps/fibu/templates/fibu/booking/index.html

biscuit/apps/fibu/templates/fibu/booking/new.html

biscuit/apps/fibu/templates/fibu/costcenter/index.html

biscuit/apps/fibu/templates/fibu/reports/expenses.html

biscuit/apps/fibu/templates/fibu/reports/index.html

biscuit/apps/fibu/urls.py

biscuit/apps/fibu/views.py