PICTFormat: set bits per pixel

Bits per pixel were not being set in PICT format. This has been
corrected.
NativeQTFormat: set bits per pixel

Bits per pixel were not being set in the NativeQTFormat. This has been
corrected.
NRRDFormat: Set bits per pixel

Bits per pixel were not being set in the NRRDFormat. This has been
corrected
GIFFormat openPlane sets colorTable

The GIFFormat Reader's openPlane method now sets the ColorTable of the
provided plane.

Because this could potentially lead to more calls to the Metadata's
getColorTable method, the table is now cached.
Added JAIIIOService sa a FormatService parameter

The JAIIIOService is needed to load JPEG2k format images, which is a
core format. Thus it's now a FormatService parameter.
JPEG2000Codec now sets its service

In the setContext method, JPEG2000Codec will now initialize itself and
find the JAIIIO service.
WIP: CellImg