Include hasher in original file construction.
Add checks for checksum algorithm specification.
add note of SHA1 hasher into RepoFile
Fill in hasher property when creating original files.
fix commment: Unicode space looks terrible in MacRoman
Merge pull request #1020 from mtbc/trac-10338

Further work on checksums
Add default SHA1-160 setting to omero.properties
Force Spring to create ChecksumAlgorithm bean
Add checksumAlgorithm field to repos
Fix repo ctors in test classes
Add getter for settings in MngdImportProcessI
Use checksum algorithm in ImportLibrary
Add TODO