kohabug 2404 This patch removes Image::Magick and adds GD

kohabug 2404 This patch removes Image::Magick and adds GD

This patch removes Image::Magick as a dependency and replaces it with
the (much) lighter GD. Functionality of patronimage code has not changed with
this conversion.

Adding errorhandling for corrupted image file and link to return to moremember.pl when called from there

Added notes about supported image mime types.

Signed-off-by: Galen Charlton <galen.charlton@liblime.com>
Signed-off-by: Joshua Ferraro <jmf@liblime.com>