Merge pull request #200 from AndHam89/master

Suppress the buttons on the printout for pages cabnaviagtor.php and dc_stats.php
Added delete button with confirmation for site admins to PDU screen. close #194
Converting PDU methods over to PDO. #164  Corrected a typo on a table name for #137 fac_cabrow vs. fac_CabRow
All CDU/PDU methods converted over to PDO as well as all references to these methods updated. #164
Bug in Slot number for chassis devices in paths.php .  #174
Change of port status indicator from text to small icons per Scott's request. #191
Forgot to change how the JS was handling the up/down status. Addition to @000e186
Updates the /cabnavigator.php in two respects, zero rack unit drop, flags appear in legend only if used