Creates a param spec to hold a file param.
See ParamSpec.internal for more information.
| name |
Canonical name of the param |
| nick |
Nickname of the param |
| blurb |
Brief description of param. |
| action |
The type of file to expect. |
| none_ok |
Whether null is allowed. |
| default_value |
File to use if none is assigned. |
| flags |
a combination of ParamFlags |
|
a newly allocated ParamSpec instance |