Sort signs added somewhere, some reports improved

Description

Sort sign added to A004, F002, F005, L001 where sort is defined in sql.
A004: sort by database size added.
A006: pretty value for sizes.
H001: Num column renamed to #, replicas output removed
H003: parent_writes format added.
F001: '%vacuum%' settings added.

Related issue

https://gitlab.com/postgres-ai-team/postgres-checkup/issues/207 https://gitlab.com/postgres-ai-team/postgres-checkup/issues/44 https://gitlab.com/postgres-ai-team/postgres-checkup/issues/188

Examples

See example in slack https://postgres-ai.slack.com/archives/CE6NYN64W/p1548356796074400 and full report here https://postgres-ai.slack.com/archives/CE6NYN64W/p1548407648019900

Closes #207 (closed)