[HTAGS PATCH ] recognize continued line, support null directive. warn about unknown directive.

[Hideki IWAMOTO]

Attached patch htags-pp.patch makes the next change to htags.

 o Recognize continued line.

 o Add support of null directive(#).

 o Warn about unknown preprocessing directive like this.
    Warning: unknown preprocessing directive '#icnlude'. [+11 m.c]

Attached source file m.c will be converted to 1.html.   

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Hideki IWAMOTO  address@hidden

m.c
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1.html
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htags-pp.patch
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