Signed-off-by: Simon Lipp <laiquo@hwold.net>

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

Because unsurprisingly pastealacon has silly restrictions.

For pastealacon, it is used to check for encoding compatibility.

Basic support in pastoob added (there is no way yet to change the
default options).
Backends support the "public/private" requirement.

And fix the capability.

It is able to get a paste, and post a new one.
Only the contents and title fields are supported for now.