Add support for MicroRNA BGX files to reporter importer

[Nicklas Nordborg]

See #215 and #236 for some background info.

[Nicklas Nordborg]

The feature importer should already be able to handle the MicroRNA BGX files. It only cares about the Probe_ID and Array_Address_Id columns and ignores all other columns.

The problem with the BGX reporter importer stems from the BgxMergeControlsInputStream class which merges reporter information for rows that have duplicated the Probe_Id from another row. I think this code could be generalized a bit:

• The Probe_Id is used as the key. Duplicate rows should be merged.
• The Array_Address_Id column is always ignored since it is only relevant for features
• All remaining columns are merged no matter how few or many they are.

The first two points are more or less the same as in the current code. The third point is currently hardcoded to require 4 additional columns (Reporter_Group_Name, Reporter_Group_Id, Reporter_Composite_Map and Probe_Sequence).

[Nicklas Nordborg]

(In [1147]) Fixes #237: Add support for MicroRNA BGX files to reporter importer

[Nicklas Nordborg]

The importer imports data from the [Probes] and [Controls] section. The other sections, [ControlGraphs] and [ControlBars], doesn't seem to have reporter data and are ignored.