Archives install script tied to master

Created by: avullo

The install script for previous releases downloads and builds the master branch code. An excerpt from running it for 2.7, showing how it is bound to the current release number as set in master (2.9):

*** Building Bio::DB::HTS *** CMD : env HTSLIB_DIR=/tmp/lCFQHly_Rz/htslib perl Build.PL Created MYMETA.yml and MYMETA.json Creating new 'Build' script for 'Bio-DB-HTS' version '2.9' Building Bio-DB-HTS cc -I/tmp/lCFQHly_Rz/htslib/htslib -I/home/avullo/perl5/perlbrew/perls/perl-5.16.0/lib/5.16.0/x86_64-linux/CORE -DXS_VERSION="2.9" -DVERSION="2.9" -fPIC -D_IOLIB=2 -D_FILE_OFFSET_BITS=64 -Wno-error -Wno-unused-result -c -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -O2 -o lib/Bio/DB/HTS.o lib/Bio/DB/HTS.c ExtUtils::Mkbootstrap::Mkbootstrap('blib/arch/auto/Bio/DB/HTS/HTS.bs') ...

This is about introducing a version variable in the install script, and keeping it in sync at release time with the version number as set in the various modules.