Miscounting lines in doctokinizer

When having a file like:
```
@page md_aa aa

Last \error2

- Install \error3
```
we get the warnings:
```
aa.md:3: warning: Found unknown command '\error2'
aa.md:7: warning: Found unknown command '\error3'
```
instead of
```
aa.md:3: warning: Found unknown command '\error2'
aa.md:5: warning: Found unknown command '\error3'

```

Investigation lead to that this is due to the fact that with a `REJECT` the line counter in `doctokinizer.l` is not reset. By counting the lines ourselves we can properly count the lines.
(Other lexers don't have this problem as here we already do the counting ourselves)

1 files changed, 3 insertions, 1 deletions

diff --git a/src/doctokenizer.h b/src/doctokenizer.h
index f43cd07..235b403 100644
--- a/src/doctokenizer.h
+++ b/src/doctokenizer.h
@@ -115,12 +115,14 @@ struct TokenInfo
 
 // globals
 extern TokenInfo *g_token;
-extern int doctokenizerYYlineno;
 extern FILE *doctokenizerYYin;
 
 // helper functions
 const char *tokToString(int token);
 
+void setDoctokinizerLineNr(int lineno);
+int getDoctokinizerLineNr(void);
+
 // operations on the scanner
 void doctokenizerYYFindSections(const char *input,const Definition *d,
                                 const char *fileName);