Omni-0.4.0 released

- Added 21 new Hewlett Packard LaserJets to the omni driver!
- Added an internal resolution to the DeviceResolution class so that a printer
that can support hardware scaling could be implemented.
- Added compressing RGB data to GplCompression.
- Moved the GplpGenerateGammaCurve function in GplDitherInstance to public.
- Converted the Steinburg algorithm from integer math to floating point math.
Added 6 color support and multi-bit support to the Steinburg algorithm.
- Added %f to PrintDevice::sendPrintfToDevice.
- Fixed bug in DeviceDither::getDitherCatagory.
- Updated Epson Stylus Photo 870, 875DC, & 1270 for 4 color support. Resolved
problems printed at 360 dpi in 4 colors on the 870 & 875DC.
- A lot more work was done for UPDF support.
- Added Device::getShortName () which returns the name of the file (minus the
lib and .so parts).
- Added DeviceXXX::getName (id) which returns the NLV translated name for a
form (without creating a new form object and querying that object). For
the following classes: Form, Tray, Media, PrintMode, Resolution, and
Orientation.
- Added DeviceXXX::isXXXSupported (id) that will query if an id is supported
for that device without having to create a new object of that id. For the
following classes: Form, Tray, Media, PrintMode, Resolution, and Orientation.
- Added prototype Foomatic support.