$subformat was being set rather than checked in if statement

Line 266, changed = to == so the if statement works.
Update INSTALL_RHEL.md
Updated hostbox-basic.inc.php as number of <td>'s were incorrect

Added 3 <td>'s to resolve table formatting and ensure view looks consistent with details page.
Fixed detail/basic view code so this now runs correctly

Added || $subformat == "basic" to if statement that checked for just details view before.
Merge pull request #33 from laf/issue-32

Issue 32
Merge branch 'master' of https://github.com/laf/librenms into issue12
Updated billing-calculate.php

Changed mysql_query to dbQuery