PCI layer names have disappeared since the new SDK is in use

[gaige]

Prior to 1.7, PCI Layer names were based on the layer description in the metadata. Now, that information is never loaded. This patch restores the SetDescription? call.

A change to the SDK was necessary to push the value through.

==== frmts/pcidsk/pcidskdataset2.cpp#2 (text) ====

160a161,164
> 	
> 	std::string channelDescription = poChannel->GetDescription();
> 	
> 	this->SetDescription( CPLString(channelDescription));
1373c1377,1379
<             poDS->SetBand( iBand+1, new PCIDSK2Band( poDS, poFile, iBand+1 ));
---
>             PCIDSK2Band *newBand = new PCIDSK2Band( poDS, poFile, iBand+1 );
> 			char **metaData = newBand->GetMetadata( NULL);
> 			poDS->SetBand( iBand+1, newBand);

==== frmts/pcidsk/sdk/channel/cpcidskchannel.cpp#2 (text) ====

41a42,52
> void PCIDSKChannel::SetDescription( std::string value)
> {
> 	description = value;
> }
> 
> std::string PCIDSKChannel::GetDescription()
> {
> 	return description;
> }
> 
> 

==== frmts/pcidsk/sdk/core/cpcidskfile.cpp#2 (text) ====

400a401,404
> 		
> 		// fetch description
> 		std::string description;
> 		ih.Get(0,64,description);
461a466
> 		channel->SetDescription( description);

==== frmts/pcidsk/sdk/pcidsk_channel.h#2 (text) ====

43a44
> 		std::string description;
63a65,67
> 		
> 		std::string GetDescription();
> 		void SetDescription( std::string value);

[warmerdam]

Support for reading and writing descriptions added to the PCIDSK SDK in trunk (r18783).

Support for attaching channel descriptions to the PCIDSK2Band added to GDAL in trunk (r18784).