Parsing Error with SSW

[MicahGale]

Describe the bug

A parsing error is occurring when reading an SSW input.

To Reproduce

A short code snippet of what you have ran. Please change or remove any specific values or anything that can't be public. For example:

problem = montepy.read_input("foo.imcnp")

Error Message (if any)

If an error message was printed please include the entire stacktrace. If it includes any specific values please change or remove them. For example:

    >37304|  ssw cel= 3000  20000  21000  22000  23000  30000  31000
          |         ^ not expected here.
    There was an error parsing "=".
    sly: Syntax error at line 1, token==

Version

• Version 0.5.3.post1

[MicahGale]

I think making param only data inputs should be added as parsable.

[MicahGale]

This is documented in section 5.8.8 of the 6.3.1 manual. I think the issue is that cell isn't a keyword here.

We can add CEL, PTY, and SYM. Probably could also hit #636, #607 with this.