gnubie questions

[ota pimlott net]

Hi.  I'm rather new to gnumeric and spreadsheets in general.  I have
a few random questions:

  - Is there a function to get the value of the cell at a given row
    and column?  Ie, F such that =F(1, 1) is equivalent to =A1.
    Seems like a no-brainer, but I couldn't find it in my scan
    through the docs.

  - Is there any feature that would allow me to identify two or more
    cells with each other, requiring that they always have the same
    value?  I would want to be able to change any one of them, and
    have the others all change automatically.

  - Is there any feature to hide rows/columns by a pattern?  Say I
    have a column containing a running total by month, and I want to
    see only values for the end of each year.  Is there a way to
    hide all but every twelfth row?

  - What is the current status of extension languages?  I looked at
    the Python support a bit (eg, gnome_glossary.py), but I don't
    see any documentation, so it's hard to figure out what all the
    possible hooks are.  What is the status of the guile plugin?
    Are there any plans or work-in-progress anywhere?  I'll start
    digging into the code tomorrow, but I thought I'd ask if there's
    any other information I've missed.

Thanks,
Andrew