removed unused file, updated README, added to user_guide, improved doxygen, documented random number generator #157

	# This is a CI workflow for the NCEPLIBS-w3emc project.
	#
	# This workflow builds on Linux with different versions of the
	# dependent packages.
	#
	# Ed Hartnett, 1/8/23
	name: Linux_versions
	on:
	push:
	branches:
	- develop
	pull_request:
	branches:
	- develop

	jobs:
	Linux_versions:
	runs-on: ubuntu-latest
	env:
	FC: gfortran-11
	CC: gcc-11
	strategy:
	matrix:
	bacio-version: [2.4.1, 2.5.0, 2.6.0]

	steps:

	- name: checkout-bacio
	uses: actions/checkout@v3
	with:
	repository: NOAA-EMC/NCEPLIBS-bacio
	path: bacio
	ref: v${{ matrix.bacio-version }}

	- name: cache-bacio
	id: cache-bacio
	uses: actions/cache@v3
	with:
	path: ~/bacio
	key: bacio-${{ runner.os }}-v${{ matrix.bacio-version }}

	- name: build-bacio
	if: steps.cache-bacio.outputs.cache-hit != 'true'
	run: \|
	cd bacio
	mkdir build && cd build
	cmake .. -DCMAKE_INSTALL_PREFIX=~/bacio
	make -j2
	make install

	- name: checkout-bufr
	uses: actions/checkout@v3
	with:
	repository: NOAA-EMC/NCEPLIBS-bufr
	path: bufr
	ref: v12.0.1

	- name: cache-bufr
	id: cache-bufr
	uses: actions/cache@v3
	with:
	path: ~/bufr
	key: bufr-Linux_options_${{ runner.os }}-v12.0.1

	- name: build-bufr
	if: steps.cache-bufr.outputs.cache-hit != 'true'
	run: \|
	cd bufr
	mkdir build && cd build
	cmake -DCMAKE_INSTALL_PREFIX=~/bufr ..
	make -j2
	make install

	- name: checkout-w3emc
	uses: actions/checkout@v3
	with:
	path: w3emc

	- name: build-w3emc
	run: \|
	cd w3emc
	mkdir build
	cd build
	cmake -DCMAKE_PREFIX_PATH="~/bacio;~/bufr" ..
	make -j2

	- name: test-w3emc
	run: \|
	cd w3emc/build
	ctest --output-on-failure --rerun-failed --verbose

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