The string may not always start with "PostgreSQL" when building
against non-community versions.
Life would be much easier here if there was an option like
"pg_config --version-number" or similar.
Previous initial "major" releases were two-element only (e.g. 4.4);
beginning from repmgr 5 we want to ensure all version numbers have
three elements, for general consistency, including the generation
of package names.
Note that the next release is intended to be 5.0 to coincide with the
release of PostgreSQL 12; 4.5 is currently a placeholder in case we
need to push out a feature release before then.
This brings the repmgr documentation build system in line with that
used by the main PostgreSQL project, and removed the restriction
that documentation must be built against PostgreSQL 9.6 or earlier.
Main formatting changes are:
- convert empty-element tags (mainly <xref/>)
- put <indexterm> sections in the correct location
- correct usage of various entities.
This was required for a specific use case during pre-release
development and is no longer needed now the physical streaming
replication handling is implemented.
