1.2.0-rc.2

In the second release candidate, we fixed some issues of the previous version and improved documentation, as well as some features.

Fixes and improvements

Fixed synchronisation: #556
Fixed key pair validation: #557
Ametsuchi: fixed root permission for account creation: #610
PostgreSQL: reconnect to working database after failure: #564
Ursa build dependancy fix: #629
Fixed s390x build related issues: #637
Fix ninja build in wsv_query_test: #632
Make query signature check case-insensitive: #606
Added CompareAndSetAccountDetail.need_to_check_empty for legacy compatibility: #612
Documentation fixes: #544, #522, #560, #634, #625, #658, #588, #513, #652