Tidy up PHP short tags.

Bunch of updates from skel to sort the encoding of filenames.
I'm beginning to think that we should be just encoding the whole
name or something like that :)

return nothing if we don't get a match - this is what was happening
anyway, except it generated a warning whilst doing it.

Updates from skel (Daniel Piddock):

 - Fix overflow in disk inodes on PHP page.
 - Added code to get passed in variables from the $_GET variable. Makes
   things work under a pretty default Debian apache2/php4 set up.
 - Graphs displays "Network IO" in the drop down list, not "Network usage"
   for consistency with everything else.
 - Display Swap, memory and disk usage in MB rather than bytes in latest
   view.
 - Display uptime in a pretty days/hours/minutes/seconds rather than just
   seconds, in latest view
 - Include file system type under Disks in latest view

Thanks Daniel!

Update the web pages to deal with the new data.

Updated the "latest data" page to link to the newer graphs.php script
rather than the obselete browser.php script.

Slightly better - this way we will still show all the disks.

empty($var) tests if $var is unset AND if $var is 0. We don't want the
latter so we now use !isset($var) instead. This only tests if it is unset.

Included the year in the report date.... for those people that
accidentally turn off their i-scream server and don't notice for a couple
of years......

Put the mount point of disk graphs on the next line, as if these are too
long, it causes the graph to be stretched.

Removed the echo of disk information beneath each bar

Stopped the disk loop going forever when it reached the last disk(!)

Blimey, added all the stuff needed to make reports on all the disks described
in the packet.

Bar displays can now be called with the optional paramter of $arrange.  If
this is set to "swap", then the 'difference' is displayed.  I.e. if we
have the data available for free memory and total memory, then it will be
possible to display a bar of used memory.

Added links to charts for all scalar values that are numbers.
Corrected the spelling of "Receipt" while I was at it... well,
nobody else noticed ;)

Minor changes

Now got a function to provide a link to the relevant historical report

File listing function is included from the shared iutil.inc.php file.

Minor changes

Graphs display their actual value rather than just a graphic

Added age warnings to the reports.  Jibbled the layout a little as well.

Graphs at the bottom of the page are now centered.  This seems to look
better.

Cell contents in showStat(. . .) are now aligned to the top of the cell.

Added virtually all of the report fields to the display list (phew).
This now also used the printLine() method to separate fields as desired.

The preg_match on the packet data now matches with an optional "}" at the
end of a value such that the last item in a packet is never forgotten
about

Modified the config so that the report data comes from the group file
space.  The latest.php file now also allows the report file name to be
configured... this is because Tim wrote the first lot with the wrong
filename ;)