Add more JavaDoc

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Suppress those pesky restriction warnings

We really, positively, want to implement Eclipse-specific hooks and
*not* get warnings like this one: 'The type HookConfigurator is not
accessible due to restriction on required library'

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Add final missing JavaDoc

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Fix final warnings

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>