[Add] sampledates: notrail option

Signed-off-by: Oleg Komarov <o.komarov11@imperial.ac.uk>
[Change] re-factor with sampledates to create betas qunatiles graphs

Signed-off-by: Oleg Komarov <o.komarov11@imperial.ac.uk>
[Add] iprice2dret: intraday prices to daily returns

Signed-off-by: Oleg Komarov <o.komarov11@imperial.ac.uk>
[Add] Cap-weighting #1

Signed-off-by: Oleg Komarov <o.komarov11@imperial.ac.uk>