- add %%capo
- changes
  - change the "Line too much shrunk" message severity to 'error'
  - move build date from display_version
  - increase the max number of staves to 32
  - add 'under' as a synonym of 'below' in %%pos
  - accept 5, 7 or 9 as note length divider with L:auto
- fixes
  - abnormal error when %%format with a PostScript file
  - bad direction of beamed notes in single tunes since commit 1470bdb
  - bad chord duration since commit 34aa175
  - bad handling of +: for history (H:)
  - bad vertical offset of right/left annotations
  - abnormal error message on command line flag '-p'