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Increases the contents of the corresponding cell in the selected Confusion by one.
Given the following Confusion:
          u    i    a   ! The response labels
    u     6    2    1   ! Responses on stimulus  u,
    i     3    4    2   ! Responses on stimulus  i
    a     1    4    4   ! Responses on stimulus  a
The command Increase: "u", "i" results in:
          u    i    a   ! The responses
    u     6    3    1   ! Responses on stimulus  u,
    i     3    4    2   ! Responses on stimulus  i
    a     1    4    4   ! Responses on stimulus  a
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