Updated LineCoReg2PreProc

-fixed ability to handle no line files in .coreg folder
-saves 2 sets of images - 1 in .coreg folder, 1 in folder specified by
user
-added hard coded information at top of file
-added QAQC figures
-added a VERY BASIC filtering code with hard-coded thresholds to remove
aerosol scatter close to the lidar.....THIS NEEDS FUTURE ATTENTION!
-fixed timestack QAQC plot