major rewrite of some rcs parsing stuff:

- rework rcs_getrev() to correctly support branches
- rework rcs_translate_tag() to correctly translate given symbols or
  branches into their matching revisions
- rework rcs_rev_add() to correctly update its 'next' pointers
  and insert the new revision in the correct place on the list.
- rework rcs_head_get() to return the latest revision on the default
  branch if it has been set or the normal HEAD revision otherwise.
- no longer access the rf_head member of the RCSFILE struct manually,
  use the rcs_head_get() function which correctly returns the HEAD
  revision, there might be a default branch that has to be used.
- for now, when commiting a new revision reset the default branch.

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