Metamorph: allow both sanitized and unsanitized delimiters

If the XML was not completely sanitized, the delimiter can still be
'&#130;&#10;'.  This is needed as a result of c62aca3.
Use __import__ for generateDS to handle FS case issues

While mounting the source tree from an OSX 10.10 host
over boot2docker to an Ubuntu container, Bio-Formats
builds failed with:

```
Traceback (most recent call last):
  File "./xsd-fu", line 45, in <module>
    from ome.modeltools import generateds
  File "/opt/tmp/components/bioformats/components/xsd-fu/python/ome/modeltools/generateds.py", line 6, in <module>
    from generateDS.generateDS import XschemaHandler, set_type_constants
  File "/opt/tmp/components/bioformats/components/xsd-fu/python/ome/modeltools/generateDS.py", line 6, in <module>
    from generateDS.generateDS import XschemaHandler, set_type_constants
ImportError: No module named generateDS
```

since there is a case-insensitive clash between our
ome.model.generateds (imported relatively) and
generateDS.generateDS (imported absolutely).
Fix mock object to match changes from int to double for channel
Use absolute_import instead of __import__
Fix voltage from int to double.
Do not put XML comments into the original metadata table
Remove source links hyperlinks from Java source files

URLs were mostly used to create links to the source code from the Javadocs.
However, it is hard to maintain across the board. Furthermoe it links to a
branch rather than a tag.
Merge pull request #1453 from jburel/mock

Fix mock object to match changes from int to double for channel
Merge pull request #1455 from sbesson/javadocs_sourcelinks

Remove source code hyperlinks from Java source files
Merge pull request #1448 from melissalinkert/metamorph-delim-part-2

Metamorph: allow both sanitized and unsanitized delimiters
Merge pull request #1452 from joshmoore/xsd-fu-imports

Use __import__ for generateDS to handle FS case issues