Progress: continue implementing fss_basic_read, also numerous other fixes/tweaks

Progress: continue implementing fss_basic_read, also numerous other fixes/tweaks

I decided to allow --at and --name to be used at the same time (and therefore at the same --depth).
The depth code is to be rewritten and that is only partially rewritten.
Many of the parameters are now written and the fss_basic_read needs to be tested and reviewed.
(There fss_basic_read is still incomplete, but there is enough working code to begin testing.)