Updates to azgcorr (and azexhdf)

1. change to the arsf user
2. copy the release file to ~arsf/usr/arsf_releases/relXXX.tar.gz (rename to add .tar.gz)
3. uncompress to ~arsf/usr/arsf_releases/bill-YYYYMMMDD/ (where the date is the date of receiving, ish)
   1. mkdir ~arsf/usr/arsf_releases/bill-YYYYMMMDD/
   2. cd ~arsf/usr/arsf_releases/bill-YYYYMMMDD/
   3. tar xzvf ../relXXX.tar.gz
4. [probably safe to skip this next step now] rename the files from azgcorr.489 to azgcorr.4.8.9 (arguably unnecessary now, but used to be done to allow us to script updates. 489 is not sortable while 4.8.9 is, when version numbers get > 10)
5. test it works! (need a regression test - see #12)
6. cd to ~arsf/usr/bin and symlink the new binaries there
7. ftp updated azgcorr and azexhdf to the ARSF ftp site (see internal wiki? for login details, use mgrsw user), remove old versions as needed
8. update azgcorr & azexhdf in active delivery template directories (~arsf/in_progress/*/delivery_template/bin/)
9. notify Andrew Wilson and neodc@… of the update, with a short description of what it is and a link to the FTP site