Speclib Tutorial 2: Collect profiles from images

[jakimowb]

Create a short tutorial that shows how to collect spectral profiles from an image

• use testdata set
• use cursor identify tool
• show spectral profile source options (source, kernels, scaling)
• show how to collect profiles from differen timages at same time
• show visualization settings

[jakimowb]

Done with 29ac88ff42e78c2b2ffc08245e014507526415df