Added checks for old VCL clip query date arguments.
Added checks for old VCL clip query date arguments.

VCL will now quit with a command syntax error if any of the old
`--date`, `--start-date`, and `--end-date` arguments are used. Then
names of these arguments were changed in
073d4233816ad0b8b42ab75c998d2607eb7734c6.
HaroldMills/Vesper,HaroldMills/Vesper,HaroldMills/Vesper,HaroldMills/Vesper,HaroldMills/Vesper