Update INSTALL_RHEL.md

Corrected path to http config file:

/etc/httpd/conf.d/librenms.conf
Merge pull request #31 from laf/patch-1

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