This patch addresses the following problems in the feta sources

This patch addresses the following problems in the feta sources
files which contribute to the fetaXX fonts.

. Many fixes for rasterization at low resolutions (consistent use of
  `vround' and `hround', integer shift values for paths, applying
  `eps' for mirrored paths, use of `define_whole_pixels' and
  friends, etc.) -- while this probably looks like a waste of time
  it has revealed deficiencies in some glyph shapes.  See comment at
  the end of feta-params.mf how vertical symmetry is achieved.

. The `---' operator has been replaced everywhere with `--'; this
  both improves and considerably reduces the font size after
  conversion with mf2pt1.

These change aren't explicitly mentioned below since virtually all
glyphs are affected.

Other notable differences:

. Glyphs from feta-accordion.mf now have charboxes around the
  outline.

. Fixed incorrect charbox for `accDot'.

. The `rcomma' and `lcomma' glyphs were distorted due to a typo.

. Fixed position of the bow in the `upprall' glyph and its siblings.

. The bulb size in the `2/2 meter' and `4/4 meter' glyphs is now
  dependent on the staff line thickness to avoid touching the middle
  staff line at smaller sizes.

. Largely extended output for feta-testXX: Where useful, glyphs
are shown both between and on staff lines.

* mf/feta-params.mf (staff_space_rounded,
stafflinethickness_rounded, linethickness_rounded,
ledgerlinethickness_rounded, stemthickness_rounded): New variables.
Update all code which uses them where appropriate.
(feta_eps, feta_shift, feta_space_shift, feta_offset, feta_fillpen):
New variables used to control rasterization at low resolutions.  Set
to zert if feta code is processed with metapost.

* mf/feta-macros.mf (draw_staff, draw_staff_outline): Updated.
(draw_rounded_block, draw_square_block): Updated to use `--' only.
(flare_path): Updated.
Make it work with `filldraw' (but only circular pens).
(hfloor, vfloor, hceiling, vceiling): New macros.

* mf/feta-params.mf (to_bp): New macro for mf2pt1.
(set_char_box): Updated.
Add code which emits specials for mf2pt1 if run with metapost.

* mf/feta-accordion.mf ("accDiscant", "accFreebase", "accStdbase"):
Use `draw' again in mf mode to have good pixel dropout control.
Fix intersection points of horizontal lines with circle.
("accDot"): Fix parameters for set_char_box.
("accOldEE"): Use `draw' again in mf mode to have good pixel dropout
control.

* mf/feta-banier.mf: Updated.

* mf/feta-bolletjes.mf (remember_pic): New variable, used for
testing.
(undraw_inside_ellipse): Remove `center' argument.  Update all
callers.
(draw_brevis): New macro, called by "Brevis notehead".
(draw_whole_triangle_head): New macro, called by "Whole
trianglehead".
(draw_small_triangle_head): Use `filldraw'.

* mf/feta-eindelijk.mf: Remove useless global group.
Updated.

* mf/feta-klef.mf (draw_c_clef): Correct point positions for using
`filldraw'.

* mf/feta-pendaal.mf: Updated.

* mf/feta-puntje.mf: Updated.

* mf/feta-schrift.mf (draw_very_long_fermata): Simplified to use
less points.
("Flageolet"): Use `draw' again in mf mode to have good pixel
dropout control.
("Varied Coda"): Use `draw_block'.
(draw_comma): Fix typo.
(draw_arpeggio_arrow): Use `draw' also in mf mode to have good
pixel dropout control.

* mf/feta-slag.mf ("upprall", "downprall", "lineprall"): Fix start
position of bow.

* mf/feta-timesig.mf (draw_C): Reduce bulb size for smaller design
sizes.

* mf/feta-toevallig.mf (remember_pic): New variable, used for
testing.
(draw_meta_sharp): Much simplified.
("Sharp", "1/2 Sharp", "3/4 Sharp"): Don't rotate but shift.

* mf/feta-test-generic.mf: Include all files as in feta-generic.mf.