Add update_uci mode in CLI and test UCI files

[rburghol]

This is a prototype to allow an update of settings ONLY from a UCI into an hdf5 that has already been created with hsp2 import_uci ....

• Copies parameters over, but omits timeseries data like WDM, mutsin ...
• This results in a huge time savings when testing, and I can only imagine that if I were developing a model that was UCI based, I would be very grateful for this feaure.
• I consider this ready to merge as it DOES work initially, but caveats follow.
• This works well the first time, but subsequent attempts fail when trying to run due to duplicate column names that occur due to renaming in the function readUCI()
• See this issue for details on the problems with this function after the 2nd update attempt: Bug: readUCI() renames columns before setting defaults, but does not flush to hdf5, which creates duplicate columns #201

[timcera]

Since you aren't reading any time-series from the WDM files you don't need to read the UCI file to get the WDM file names. Just need "readUCI(ucifile, h5file, False)"