flake8 --select W391,E302,E301,E304

autopep8 can't fix W391 even though it claims it can.
Fixed using a simple custom script.

Remove useless trailing \
Remove trailing spaces
Add missing empty lines

autopep8 -ir -j2 --select=E301,E302,E502,W291,W293,W391 .

Diff quickly checked.

Modules can raise this exception when they want to print errors to user

moved ICapDating.get_status() and ICapMessagesPost.get_status() into ICapAccount.get_account_status()

code clean