Use current time as date re #7617

Also remove optional attribute of instrument (hard to determine).

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>
Add empty banks to parameter file re #7617

Also tidied up the child algorithm code with help of Martyn

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>
Merge branch 'feature/7617_fullprof_to_xml' into develop