Parser tries to continue parsing a keyword across end of include file

[blattms]

We have some pointer semantics that break when the parser thinks a keyword in a n include file has not ended but the file has. It will happily read the next line in the outer file and hell (a segmentation fault with the usual non-user-friendly error message) will break loose.

Noticed on an include file where the last non-whitespace entry was a backslash instead of a sleash.

T.B.C