syntax but to use the array2d<type> syntax.

anymore to declare it.  Now you just say array2d<type>.

then calls the appropriate image loading function.

I/O options dlib supports.  Also added ones which can work directly with
a string file name.

file is corrupted in the middle it won't just print a message and abort
the program.

it's last modified time.

time on each page to be the last time the corresponding XML file was modified
rather than the overall project release date.

so it matches the interface of the structural_svm_problem.

you sometimes get from visual studio about
"decorated name length exceeded, name was truncated".

What I did was introduce a new type called _void as the deafult
template parameter for the type_safe_union rather than use the T1
type as the default for the 19 other parameters.  Since _void is
always a short word it helps keep the warning from showing up.