Sort by transaction time (Asc/Desc) (#32)

* Sort by transaction time

* Address review comments

* Add sort by time constants

Ignore duplicate transactions that occur at same time (#31)

Release v1.2 (#30)

* Support additional operators in field based search

* Add index on table lines

* Add index on account ID to lines

* Remove unnecessary logs

* Remove unnecessary logs

* Introduce in and is operators in range

* Fix issue with null values

* Add test cases for in and is operators

* Sort transactions by timestamp

* Fix lines sorting

* test uuid table

* Remove test table

* Fix docs

* Fix docs

* Fix docs

* Remove QBank specific indexes

* Add docs on environment variables

Allow clients to provide timestamp (#29)

Skip lock error while migration (#25)