Implement a way to specify more default options.

[ns-echen]

Currently, groups of values for the following command line arguments can be stored in profiles listed in the .lsi file:

• SSH user name
• SSH keyfile
• filters
• exclude
• command for remote host(s)
• no_prompt (whether to disable confirmation for SSH command)

We can implement a way to specify other default options so users don't have to pass flags each time to specify preferences like whether to be verbose, whether to print out the running command, etc. These user-specified default configurations can live in the .lsi file or a different config file.