Add core_packages.txt, check_updates.sh, compare_packages.sh and...

Add core_packages.txt, check_updates.sh,  compare_packages.sh and packages.yaml to the tools directory (#1949)

* Add check_updates.sh script and packages.yaml

Update packages.yaml

Update packages.yaml

Update packages.yaml

Add compare_packages.sh

Correct c_ares download url

Add new packages to packages.yaml

Update packages.yaml

- Add core_packages.txt
- Add options to limit checks in check_updates.sh

Update packages.yaml

* Update packages.yaml

* Update packages.yaml

tools/check_updates.sh

+#!/bin/bash
+if ! test $(command -v elinks 2> /dev/null); then
+  crew install elinks
+fi
+if [ ! -f packages.yaml ]; then
+  echo "packages.yaml not found."
+  exit 1
+fi
+grep ^url: packages.yaml | cut -d' ' -f2 > /tmp/urls.txt
+if test $1; then
+  lines=$(wc -l /tmp/urls.txt | cut -d' ' -f1)
+  offset=$1
+  urls=$(($lines - $offset))
+  if test $2; then
+    count=$2
+    tail -$urls /tmp/urls.txt | head -$count > /tmp/new_urls.txt
+  else
+    tail -$urls /tmp/urls.txt > /tmp/new_urls.txt
+  fi
+  mv /tmp/new_urls.txt /tmp/urls.txt
+fi
+for u in $(cat /tmp/urls.txt); do elinks $u; done
+rm -f /tmp/urls.txt

tools/compare_packages.sh

+#!/bin/bash
+if ! test $(command -v vimdiff 2> /dev/null); then
+  echo "vimdiff not found."
+  exit 1
+fi
+if [ ! -f packages.yaml ]; then
+  echo "packages.yaml not found."
+  exit 1
+fi
+ls ../packages/*.rb | sort | cut -d'/' -f3 | cut -d'.' -f1 > /tmp/packages_all.txt
+grep "^name:" packages.yaml | sort | cut -d' ' -f2 > /tmp/packages_to_check.txt
+vimdiff /tmp/packages_all.txt /tmp/packages_to_check.txt

tools/core_packages.txt

+autoconf
+automake
+binutils
+bison
+cloog
+diffutils
+expat
+flex
+gcc
+gettext
+git
+glibc
+glibc223
+gmp
+gnutls
+intltool
+isl
+less
+libffi
+libsigsegv
+libssh2
+libtasn1
+libtool
+libunbound
+libunistring
+libxml2
+linuxheaders
+m4
+make
+most
+mpc
+mpfr
+ncurses
+ncursesw
+nettle
+openssl
+p11kit
+patch
+perl
+perl_xml_parser
+pkgconfig
+ruby
+slang
+trousers
+util_macros
+wget
+zlibpkg