[log4plsql] Small addition to the application to allow for runtime change of loglevel.

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HI all,
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I have recently used the LOG4PLSQL software
<http://log4plsql.sourceforge.net/>  for logging in a small application.
I missed the possibility to change the logging level at runtime. In the
production environment code changes are only allowed during specified
deploy time windows, so changing the DEFAULT_LEVEL parameter in the
PLOGPARAM package specification was not an option to change the logging
level.
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See http://technology.amis.nl/blog/wp-trackback.php/352 for the source
code of the changes.
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Rgds
Dick Dijkshoorn.=20