All the ERROR_* fields are removed in favor of a more simple layer
made of ERROR, FATAL, PANIC. The two last ones are not actually used
yet, thought there should be some code paths that would need more
polishing on this matter.
The error message emitted before leaving should be fine to let the
user know what is happening.
--debug and --verbose had actually the same meaning as they were aimed
at giving to the user information regarding how the process is running,
hence both options are merged into --verbose and use elog(LOG) to decide
if a given message should be printed out depending on the verbosity of
the call. This makes a couple of routines more readable as they do not
depend on any boolean checks.
The "_()" have been removed from the code, those are aimed at being used
for translation but having them mandatorily in each log message is just
useless noise. If needed, pgut.c should be updated in consequence to
have a more portable facility.
At the same time this commit takes care of putting into correct shape
some code paths more in-line with PostgreSQL policy. There are surely
more of this kind of ugly stuff but at this stage things are more simple
and more manageable.
This mode is not actually necessary if we consider that the core of
pg_rman is the obtention of differential and full backups, the server
being afterwards in charge to recover necessary WAL segments from the
archive.
Regression tests and documentation are updated in accordance to the
changes.
In order to keep only the core of pg_rman for incremental/differential
backup, this looks necessary and makes the code more simple. Including
server log files in a backup could be subject to discussion as well,
as for example a Postgres base backup does not include them, just
because in this case server instance is not aware of the log files.
