Merge branch 'master' of github.com:AER-RC/LBLRTM

Merging the changes for release v12.15.1. This includes new absco file,
and release information changes to contnm.f90, make_lblrtm, and README.md.
This is the sort of a redo because these changes were not matched with the
 version tag previously.

Author: jrmascio

README.md

@@ -44,10 +44,16 @@ For more, please see the [Wiki page](https://github.com/AER-RC/LBLRTM/wiki/)
 
 # Cloning the Latest Release <a name="cloning"></a>
 
-Assuming the output directory should be `LBLRTM`:
+Assuming the output directory should be `LBLRTM` and that the user has [created an SSH key](https://docs.github.com/en/authentication/connecting-to-github-with-ssh/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent) (we use RSA):
 
 ```
-% git clone --recursive git@github.com:AER-RC/LBLRTM.git
+git clone --recursive git@github.com:AER-RC/LBLRTM.git
+```
+
+Alternatively, users that have not setup an SSH key but have [created a personal access token](https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/creating-a-personal-access-token#creating-a-fine-grained-personal-access-token) can use the HTTPS protocol:
+
+```
+git clone --recursive https://github.com/AER-RC/LBLRTM.git
 ```
 
 `--recursive` is important, because this repository is linked with our [common FORTRAN modules repository](https://github.com/AER-RC/aer_rt_utils) that are required in the model builds. The [cross section database](https://github.com/AER-RC/cross-sections) is also added as a submodule (it is not required for all model runs). If this keyword is forgotten, one can do:

build/README.build_instructions

@@ -4,6 +4,9 @@
 #     created:   $Date$
 
 * Makefiles are designed for use with gmake. 
+* If netCDF4 will be used (e.g., for reading the continuum in LBLRTM v12.15.1) and is not in a standard 
+* location (/usr on Unix systems) users can designate these paths in the NCL (lib) and NCI (include) 
+* variables in addlibs.inc
 * From lblrtm/build directory, type: gmake -f make_lblrtm <TARGET>
 
 OPTION            DESCRIPTION                                                       COMPILE EXECUTABLE NAME

build/make_lblrtm

@@ -1,8 +1,3 @@
-#     path:      $HeadURL$
-#     author:    $Author$
-#     revision:  $Revision$
-#     created:   $Date$
-#
 # Makefile for lblrtm
 # From lblrtm/build directory, type: gmake -f make_lblrtm <TARGET>