Log the fact that link could not created during transfer.

The error is expected when moving data and orphaned images
if the image is part of a mif.
Record exception.
removed import.
remove further mention of FS lite
expand comments on omero.fs.repo.path
remove unused FS readers config parameter
Merge pull request #1309 from jburel/mif-record-error

Log error
Merge pull request #1325 from mtbc/fs-lite

Improve FS parts of etc/omero.properties