separate. Improve the bts_seek so that it only calls close or lseek if
necessary. Otherwise it's a nop. Hide bts_seek and instead make the offset
explicit in calls to bts_get or bts_put.

o Made bit field argument to has_bit const since the function
  doesn't modify it.

Tabs have been converted to spaces and trailing whitespace have been removed.
I have fixed my emacs settings now :P

git-svn-id: file:///home/rnyberg/svngit/btpd/releases/0.1@1 76a1f634-46fa-0310-9943-bd1476092a85