Allow [, #, and space as the first character in database names.

Create standby.signal only on 12 when restore type is standby.

Expire history files.

Report page checksum errors in info command text output.

Add repo-azure-endpoint option.

Add pg-database option.

Improve info command output when a stanza is specified but missing.

Improve performance of large file lists in backup/restore commands.

Add retries to sleep when starting a backup.

Prepare configuration module for multi-repository support.

Optimize small reads in IoRead.

Allow multiple remote locks from the same main process.

Conform retry in lockAcquireFile() to the common retry pattern.

Assert when buffer used is greater than size limit.

Replace RHEL/CentOS 6 documentation with RHEL/CentOS 8.