An improved patch for 687156 and 687175 (revision 2)

This is an improved revision of the patch
http://www.ghostscript.com/pipermail/gs-code-review/2003-December/004275.html
This one appears better because some fonts significantly overestimate
FontBBox.

The patch
http://www.ghostscript.com/pipermail/gs-code-review/2003-December/004269.html
is not longer necessary.
This one fixes that problem in a more general way.

[Log message beg]
Fix (type 1 hinter) : sbw was wrongly accounted with FontBBox over 4095
units.

DETAILS :

Side bearing and width was accounted before import_shift is adjusted to
FontBBox.
Bug 687156 "some characters shifted higher in acrobat4 generated eps".

Besides that, it prevents a fixed overflow when FontBBox is zero and glyph
coordinates are big.
Bug 687175 "(type 1 hinter) A fixed overflow can happen".

This patch removes import_shift and the dependence on FontBBox.
Instead that it dynamically reduces the number of fraction bits
in transformation matrices during the glyph import.

Minor change : removed some obsolete comments.

EXPECTED DIFFERENCES :

None.
[Log message end]

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