No error handling with spartacus downloads

[Zugschlus]

Hi,

when I select a plugin from spartacus, and serendipity/plugins is not writeable by the web server, the selection is silently ignored.

s9y should:
* check whether the plugins dir is writeable and warn on the spartacus configuration screen
* issue an error message if a plugin download cannot proceed
* write either to apache's error log in that case or have its own log

[garvinhicking]

I think we've fixed this on IRC; there definitely is an error message that pops up...

HTH,
Garvin