[Fix] makeMasterFile: wrong mapping of subid to unique ids

Signed-off-by: oleg komarov <o.komarov11@imperial.ac.uk>
[Change] loadresults: loads into 'caller' ws

Signed-off-by: oleg komarov <o.komarov11@imperial.ac.uk>
[Fix] makeMasterFile: set to '' tickers with no data

Signed-off-by: oleg komarov <o.komarov11@imperial.ac.uk>
[Enhance] getPrice: more generic, retrieves from path, accepts which fieldnames

Signed-off-by: oleg komarov <o.komarov11@imperial.ac.uk>
[Change] Renamed getPrice -> getData

Signed-off-by: oleg komarov <o.komarov11@imperial.ac.uk>