Scanner hotfixes: launcher fix, optional shell command, bigdecimal
This resolves OXAL-604, OXAL-605
- The scanner application now can optionally allow for a shell command to execute at each scan step
- The launcher is fixed, so that HDF5 libraries are now found by the scanner application
- Fix for timestamps that were in bigdecimal format (converted to a double array on every save)
Tested in control room