Excel Export: Staring work on spreadsheet export.

Demo 1

Initial refactoring almost complete except for styling.
Excel Export: Feature export with categories.
Excel Export: Fixed bugs with assembly. Styling semi-complete.
Excel Export: Styling functions mainly finished and debugged. Next step is writing more patient data to cells functions.
Excel Export: Started work on patient info section.
Excel Export: Bug fixes.
Excel Export: Patient info section done. Some bug fixes.
Excel Export: Added patient information and prenatal/perinatal history sections to the export.

Partially added prenatal and perinatal history section.
Other minor fixes.

Tested to work perfectly in Excel.
Midway to completing prenatal phenotype section.

Conflicts:
	components/patient-data-sharing/export-api/src/main/java/org/phenotips/data/export/internal/ConversionHelpers.java
	components/patient-data-sharing/export-api/src/main/java/org/phenotips/data/export/internal/DataToCellConverter.java
	components/patient-data/impl/src/main/java/org/phenotips/data/internal/controller/AbstractComplexController.java
Excel Export: Missing 2 fields. Everything else is completed, but not fully tested.
Excel Export: Added clinically normal section.
Excel Export: File is now served from velocity.
Excel Export: Modified the Export XWiki file to use the excel export service.
Fixed few final bugs.
Excel Export: Rebasing introduced bug fix.
Excel Export: Minor fixes.
Excel Export: Moved the module to a different parent. Fixed other small issues.
Merge branch 'excel-export-rebased'
Issue #1088: Add Excel Export of all patients matching specific filters
Renamed submodule
[cleanup] Applied codestyle
Issue #1088: Add Excel Export of all patients matching specific filters
Include the new module in the .war