- function dimension_update() calculates the number of visible rows and columns   in text mode. The new variables 'text_rows' and 'text_cols' are used in the   text_update() function. - optimizations in function UpdateScreen() - desriptions of the functions text_update() and dimension_update() updated
- function dimension_update() calculates the number of visible rows and columns
  in text mode. The new variables 'text_rows' and 'text_cols' are used in the
  text_update() function.
- optimizations in function UpdateScreen()
- desriptions of the functions text_update() and dimension_update() updated

dariaphoebe/bochs,dbrashear/bochs,dbrashear/bochs,dariaphoebe/bochs,dariaphoebe/bochs,dariaphoebe/bochs,dbrashear/bochs,dariaphoebe/bochs,dbrashear/bochs,dbrashear/bochs