Revert "Remove packages graphicx and amssymb that were used in the template"

This reverts commit 03c7e3b09975c0d99ab5b06868e2969c3a6bfc14.
comment out loading packages that are not currently used
Merge pull request #2 from migueldvb/packages

Comment lines that load graphicx and amssymb
Add an iRODS reference
Automated refactoring
Add a reference for VOUnits
Use tt font for explicitly noted FITS header keywords
History and Provenance not History/Provenance
Need to retain capitalization in title
2.4 has been extended by Slava Kitaeff
added: Taubman 2003
Taubman entry is a SPIE proceedings

Not an article
Use bibcode as bibkey
Sort bibtex entries
Delete trailing whitespace and Ctrl-M characters
Units are not capitalised when written in full.

Also expand TBs to terabytes since we didn't use PB for petabytes.
Minor grammar fixes
Must use citep or citet and not simply \cite
testing repository update with a minor change "data is" -> "data are"
Add Reinhold Schaaf