Auto renumber of buffers can now be disabled.

Two options have been added:

• weechat.look.buffer_auto_renumber
• weechat.look.buffer_position

A bar item has beed added as well:

• buffer_last_number

When auto renumber is disabled, gaps between buffer numbers are allowed and the first buffer can have a number greater than 1.

Following options for command /buffer are affected when auto renumber is off:

• move:
  • the current number will be left free for use, and the target number can be any number >= 1 (possibly higher than the current last buffer number)
  • the value can be "-" (which moves the buffer to number 1) or "+" (which moves the buffer to the end, ie last number + 1)
• swap:
  • now the buffers are swapped in the list without being "moved"
• (+/-)N:
  • it is now working with gaps in buffer numbers
• merge:
  • it can now merge a group of merged buffers into another buffer (or buffers merged themselves)