cursor when in ex mode.

    Details:  also provide an inactive implementaion for ','

    Details:  exclusive motions seem to require extra thought

reported by J Hseu

    Details:  also rename 'atEol' to 'atEndOfLine'

    Details:  tank count() into account, fix cursor positioning after undo

    Details:  fix behaviour of 'r'

    Details:  was not recorded onh the undo stck

    Details:  prevent creation of empty "groups" that required
additional 'u' key strokes to 'undo'

    Details:  was broken due to wrong cursor selection approach

writing of partial files for now.