Fix some error checking conditionals
Pass config file path as env variable

From now on it is possible to define SALSARC and it will be used as the
user-specific configuration file.
Make it possible to skip permissions check on RC

Making SALSA_SKIP_PERMISSIONS_CHECK non-empty tells salsa to skip the
permissions check. This should be used in only in isolated environments.
Insert missing continue
Fix some mistakes
Update CLI help description
Update the example
Update README to be up to date
Improve verbose output
Fix typos