[wp-hackers] Plugins : return proper error on activation faliure

[Omry Yadan]

Some complex plugins may fail during activation (creating database 
tables or what not).

currently there is no way for plugins to return an error signal + error 
message in such cases: only thing they can do is to print the error.

this is problematic as the error does not fit well into the wordpress 
admin page, and can also cause problems if for some reason the someone 
tries to set an http header after the plugin was activated.


I suggest that we allow plugin to return error message back to wordpress 
on activation.