Thanks to Paul Curtis for reporting that 'if (i != prev+1)' would be
undefined on the first pass through this loop, because prev was never
initialised beforehand. Initialise it to a safe value.

I'm not quite sure why I ever thought it was a good idea to have a
central variadic error() function taking an integer error code
followed by some list of arguments that depend on that code. It now
seems obvious to me that it's a much more sensible idea to have a
separate function per error, so that we can check at compile time that
the arguments to each error call are of the right number and type! So
I've done that instead.

A side effect is that the errors are no longer formatted into a
fixed-size buffer before going to stderr, so I can remove all the
%.200s precautions in the format strings.

[originally from svn r9639]

pass something that isn't necessarily an unsigned short.

[originally from svn r9493]

[originally from svn r9478]

"-" as a special file name meaning standard output. I've restricted
it to just those output formats which can predictably output only
one file, just for the sake of not having to faff too much with the
others.

Probably what I should have done for all of this would have been to
write a set of wrappers around fopen, fclose and everything in
between, and use them everywhere. Those wrappers would uniformly
detect "-" and convert it into stdin or stdout as appropriate, would
avoid fclosing those files for real when told to close them, and
would also be able to handle reading a little bit of data from the
start of a file and then pushing it all back even if the file were
not seekable (which would allow input.c to lose the ugly special
case whereby it can't currently read font files from standard
input).

[originally from svn r8729]

[originally from svn r8310]

We now detect ranges of glyphs mapped contiguously and use {begin,end}cidrange
for them, and also bunch together multiple characters and ranges in each
{begin,end}cid{char,range} pair.

[originally from svn r7263]

since that seems closer to being where it belongs.

[originally from svn r7262]

things without one.

[originally from svn r7261]

beautiful I've ever written, and xpdf turns out not to support the encoding
mechanism I've chosen, but it works in GhostScript so I'm not too unhappy for
now.

[originally from svn r7259]