Replace command line parsing library for Cpp11

.github/workflows/code-coverage.yml

@@ -44,7 +44,7 @@ jobs:
           lcov --remove cov.info "extern/pdqsort/*" -o cov.info
           lcov --remove cov.info "extern/zstr/*" -o cov.info
           lcov --remove cov.info "extern/catch*" -o cov.info
-          lcov --remove cov.info "app/cxxopts*" -o cov.info
+          lcov --remove cov.info "app/CLI11*" -o cov.info
           lcov --remove cov.info "src/test*" -o cov.info
           lcov --list cov.info
           mv cov.info coverage.info

.gitignore

@@ -287,4 +287,6 @@ result
 
 # Extra unit tests
 highs-unit-tests
-highs-problem-set
+highs-problem-set
+
+build-latest

README.md

@@ -145,29 +145,41 @@ is:
 
 ```
 $ bin/highs --help
-HiGHS options
-Usage:
-  bin/highs [OPTION...] [file]
-
-      --model_file arg          File of model to solve.
-      --read_solution_file arg  File of solution to read.
-      --options_file arg        File containing HiGHS options.
-      --presolve arg            Presolve: "choose" by default - "on"/"off"
-                                are alternatives.
-      --solver arg              Solver: "choose" by default - "simplex"/"ipm"
-                                are alternatives.
-      --parallel arg            Parallel solve: "choose" by default -
-                                "on"/"off" are alternatives.
-      --run_crossover arg       Run crossover: "on" by default -
-                                "choose"/"off" are alternatives.
-      --time_limit arg          Run time limit (seconds - double).
-      --solution_file arg       File for writing out model solution.
-      --write_model_file arg    File for writing out model.
-      --random_seed arg         Seed to initialize random number generation.
-      --ranging arg             Compute cost, bound, RHS and basic solution
-                                ranging.
-      --version                 Print version.
-  -h, --help                    Print help.
+usage:
+      ./bin/highs [options] [file]
+
+options:
+      --model_file file          File of model to solve.
+      --options_file file        File containing HiGHS options.
+      --read_solution_file file  File of solution to read.
+      --presolve text            Set presolve option to: 
+                                   "choose" * default 
+                                   "on"
+                                   "off"
+      --solver text              Set solver option to: 
+                                   "choose" * default 
+                                   "simplex"
+                                   "ipm" 
+      --parallel text            Set parallel option to: 
+                                   "choose" * default 
+                                   "on" 
+                                   "off" 
+      --run_crossover text       Set run_crossover option to: 
+                                   "choose" 
+                                   "on" * default 
+                                   "off" 
+      --time_limit float         Run time limit (seconds - double).
+      --solution_file text       File for writing out model solution.
+      --write_model_file text    File for writing out model.
+      --random_seed int          Seed to initialize random number 
+                                 generation.
+      --ranging text             Compute cost, bound, RHS and basic 
+                                 solution ranging:
+                                   "on"
+                                   "off" * default 
+  -v, --version                  Print version.
+  -h, --help                     Print help. 
+
 ```
 For a full list of options, see the [options page](https://ergo-code.github.io/HiGHS/stable/options/definitions/) of the documentation website.