* Start adding params for existing isos
* Merge parameter handling code
* initial testing seems reasonable
Note that if copying files in, "wget -c " will assume
smaller-than-remote files are parts and continue
so likely will cause hashing failures
or if no hash check then corrupt isos.
* Added usage for --help
* Usage enhanced and added to Readme
* spurios unused cruft removed
If you already have a collection of ISOs downloaded you can have `quickget` find and copy your existing file into the VM directory.
~~~~
--isodir : base path beneath which to find local ISO copy
if a matching file is found it will be copied to the VM directory
--localiso : optional local ISO filename - defaults to target filename
~~~~
`quickget` will then continue to `wget` or `zsync` using that file as a prior copy. If the target file exists in the VM directory `quickget` will raise an error if you run it with `--isodir`