Changes in DOCHTM 1R2N

 - Provide for longer HTM output images to prevent truncation and SDFI errors.

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 Changes in DOCHTM 1R2M

 - Add R option, to read HTM images to insert after "TOP" anchor.
 - Add N option, to inhibit any print unless errors.
 - Use STM$PKG for signon.

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 Changes in DOCHTM 1R2L

 - Prevent misalignment following a FXFORM/END section in a DOC elt.

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 Changes in DOCHTM 1R2K

 - Encode characters in the range 0200-0377 as "&#nnn;".

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 Changes in DOCHTM 1R2J

 - Fix bug that could bypass first DOC command if title not left-justified.
 - Add LENGTH to DOC commands interpreted, as % indented from right margin.

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 Changes in DOCHTM 1R2H

 - Fix bug that mishandled blank lines in non-DOC elements.

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 Changes in DOCHTM 1R2G

 - Allow blank title for DOC input.
 - Allow SDF file or symbolic elt for HTML output.