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xmldb doesn't like empty xml files. we need to probably test this with
is_readable - it's reasonable to assume that artefact plugins might not
have db tables

already in the installer

nicer since they could be caught perfectly OK later down the track (if
they're not, the default exception handler will bitch and scream).

work.

screen if necessary.

be DatalibExceptions. Log configuration file preferences overriding
database ones.

changes:

  * removed a bunch of functions that are either there for compatibility
    with many databases, or for moodle BC reasons.
  * Made most the functions throw exceptions instead of returning false on
    error
  * Code convention cleanup
  * Added lots of notes throughout the file on why changes were made

the screen every time we load a page and the database does not exist.

escaped or not, and made the default true. This allows some messages to
have HTML in them if required.

Cleaned up some whitespace.