turning script into shell callable code for stage 7 mosaicing

testing stage 7 mosaicing with layers options and temporary files removal

testing mosaicing stage 7 and fixing inputs

more changes to master script 7, stage 7 and testing

stage 7 mosaicing following assessment, script cleaned and integrated to workflow

mosaicing functions, option to remove temporary files

mosaicing functions, fixing outputs names and directories

fixing function to create mosaics of residuals

mosaicing script function, fixing output filename and output directory

testing mosaicing in the workflow and debugging