script name when logging if the script is actually in the docroot.

to get the sanity checks done as soon as possible.

Include the auth page, but only after we know what theme we are supposed to
use, which allows drawing of correct login boxes.

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.

the session and retrieving them for display.

shiny one at some point...

document root.

about a possible optimisation for the function that gets plugin config.

SQLException class.

suspect more functions in dml.php will need to be changed, but that was the
obvious one.

wwwroot if it is not set.

Also, now throw an exception if the database could not be connected to.
This still will need some cleanup.