NHSBSP requires that each view is unique for any one patient

[Ed McDonagh]

Repeats have to be labelled as LCC2 etc, else the database fails to import the records.

[Ed McDonagh]

Hopefully generating unique view codes now refs #492

→ <<cset 26d83add59e0>>

[Ed McDonagh]

Need to get rid of the unwanted exposures before adding the numbers. Refs #492

→ <<cset ccfb44f7d621>>

[Ed McDonagh]

Merged issue489nhsbspexports into develop. Fixes #492, but needs documenting.

→ <<cset cd8a29e2cbe2>>

[Ed McDonagh]

Added ref #492 to changes/CHANGES

→ <<cset a209824915d8>>

[Ed McDonagh]

Added notes about the NHSBSP mammo exports to the docs. Refs #489, #492

→ <<cset 01a873d3ab6a>>