Extend "Experiment overview" to check for problems related to platform and data files

[Nicklas Nordborg]

Depends on #721 and #788.

The experiment overview should check:

• If the project default platform/variant has been used or not
• Check that the platform match for array design and raw bioassay
• Check that data files that are marked as "required" has been selected
• Check that the actual file contents is available on disk (ie. it is not offline)
• Check that the selected data files have been validated
• more...?

[Nicklas Nordborg]

(In [3859]) References #789: Extend "Experiment overview" to check for problems related to platform and data files

• The validation options and rules have been added. Need a bit more testing.
• Fixes some other issues with FileSet and validation of data files.

[Nicklas Nordborg]

(In [3873]) References #721, fixes #789: Extended test program to include more Affymetrix tests and to attach file to array designs and raw bioassays.