#35 replace get-* with *

[Matthias Radestock]

Procedure names starting with "get-" are unschemely -
Scheme traditionally uses |car| instead of |get-car| etc.

There are a dozen or so procedures in SISC that should
be renamed by having their "get-" prefixes removed.

[Matthias Radestock]

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I think the "get-" prefix is ok if the procedure actually "gets" something, rather than just just being an accessor.

On that basis we can keep a few of the existing "get-" procedures:
get-output-string (this one is from a srfi anyway, so we can't change it)
get-output-buffer (by analogy)
get-resource