CSV Export of limited sample data

[marshalc]

From email and meeting on 23rd May:

a CSV export function for BP to share data with WP7 Import data set WP4>WP7:

• Sample process – type (blood, urine, perfusate, biopsy) STATIC
• Sample sub-type (sample code i.e. DB1, DU1, P1, etc.) STATIC
• Trial ID - STATIC
• Barcode – VARIABLE
• Date and time of collection - STATIC

[marshalc]

Duplicated into #295.... closing this one.