Invenio-sip2

**Bug fix:**

* Fix missing parsing date.
* Fix request resend checksum validation.

**Minor change:**

* Adds module version in logging formatter.

**Bug fix:**

* Forces text encoding on checksum generation

**Minor change:**

* Improves server logging.
* Ensures that the sequence number is present in the message if the selfchek terminal sends it.
* Adds sequence number and checksum in dumped message.
* Adds cached property to extension.

**Bug fix:**

* Fixes circulation date parsing.
* Rewrites error detection for request and response message.

**Bug fix:**

* Fixes invenio-search version.
* Fixes invenio-db version.

**Minor change:**

* Catches runtime error.
* Uses pydocstyle and pycodestyle.
* Increase code coverage.
* Cleans code.

**Bug fix:**

* Fixes missing conversion of i18n language.
* Fixes date format.