Reorganize data folder structure; ignore /data/CRSP/

Signed-off-by: oleg komarov <o.komarov11@imperial.ac.uk>
Migrate work for time-invariant id (taqcusip2permno) from Matlab to MySQL

Signed-off-by: oleg komarov <o.komarov11@imperial.ac.uk>
SP500hf_datasource: added taq master file description

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