Insist on old column

[westram]

• after using Ctrl-Cursor-up/down, the editor insists on that column
  • re-using it changes the column, but behavior remains
  • restart editor needed to get back to default behavior

[westram]

Reason:

• caused by another global variable. After recent cleanup of cursor-positioning functions it was accidently only set in one case: CTRL-Up/Down?
  After that it was used on every normal up/down movement.

Fixes:

• removed global completely
• fixed behavior of Ctrl-Up/Down? (IIRC jump over groups upwards did not work)

Todos:

• Ctrl-Up/Down? shall not jump between top- and bottom area
• Bind Ctrl-Home/End? to "Jump to first/last sequence"

[westram]

• Ctrl-Up/Down? does not jump between top- and bottom area
• Ctrl-Home/End? = "Jump to first/last sequence" (of current area)
• Delete now does no longer exactly the same as backspace.
• rewrote mapping of X-keycodes (now automatically maps all modifier-versions for keys)