[TYPO3-dev] Reset plugin configurations

[Tapio Markula]

Hi

I have sometimes met problems because of old plugin configurations in 
localconf.php. I have changed configurations but also I have forgotten 
to change everything. Plugin works because of old configurations but if 
somebody else install plugin firts time, it would not work.

In order to avoid these kinds of errors, it would be nice, if
installation would have option (using a checkbox) to reset plugin 
configuration.
Then before new config has been written existing configuration would be 
first destroyed.