Flags: allow operations (| & ==) with strings

[coverage] Speed up all tests x2

[Tests] Fix AS_RESOLVER

Improve TCP.answers()

Without this code, when an out of connection TCP packet receives a
TCP answer with flag RST and the ack set to 0, it is not seen as an
answer.

This comes without regression tests because I have been unable to
find a reliable machine without firewall on the Internet.

Simple test, if 192.168.0.1 has no firewall:

>>> sr(IP(dst="192.168.0.1")/TCP(sport=80, dport=12345, flags='SA'),
...    timeout=2)

This test will not terminate without this patch.

Fixed some typos and bad whitespaces.

[Tests] Fix automaton stuck

Tests: disable debug_dissector in sniff tests

This should avoid random unrelated crashes.

* Better warning()

* Tiny import fix

* Several log fixes

* Added docstrings

* Fixed imports

Fix bugs found with python-afl

[coverage] Better unit tests for inet.py

[coverage] Fix current tests (ppi_geotag)

Looks that this line became outdated with the latest versions

* Fixed ppi_geotag on windows

and added tests

* More tests + static EPOCH

coap: dont reorder options having the same option number

[TLS] Enable DES

Add TLS support

* Improved main.py tests

* Small fixes