Fix NPE in Field#getAnnotation

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Initialize Logger instances to the 'INFO' level by default

... otherwise, logging would throw an exception when trying to
determine whether the current level allows the message to be logged.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Set File.pathSeparator and File.separator

Many Java programs expect those fields to be initialized to non-null
values, including SCIFIO (http://scif.io/).

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

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