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If no gswin32c.exe or mgs.exe are found, try a generic gswin32c,
it may be a wrapper wth different extension (.bat, .cmd, ...)

We create a "fragmaster.sts" file with each line consisting of basename
and last fragmaster dir data file successfully used for that basename if
last run used per-directory file.

In case there is any discrepancy between last and new (differences, one
of both missing) rebuild.

Once we get $global_dirdata_mtime for an available $global_dirdata_file,
we use it also as existence flag.

Rename per-dir data file stuff, "fm.options -> dirdata.fm", "$global_options_file" -> "$global_dirdata_file"

Trailing whitespace can be a problem with some options (noatably
fmclass). Strip it. In practice, this should only affect options.

* Factorize _fm parsing out to a separate function, parse_fmfile.
* Use it before looping for a new allowed "fm.options" and in loop
  for every _fm file. Make sure "fm.options" override global default
  options and per-file options override all other options.
* Document "fm-options" file in pod section.
* Cosmetic changes.

This reverts commit e2d2ea43.

I changed my mind and will not ship this file. Experienced win32
users already know what to do and others may be more confused
than helped.

If a semicolon, ';' or an equal sign (=) is used as a command line
argument to a MSDOS (and seems that for the one under win too) batch
file, it is treated as a blank space. For example,

gswin32c -q -sDEVICE=bbox

will give, when passed to a test.bat file

@echo %0 %1 %2 %3

test gswin32c -q -sDEVICE bbox

breaking ghostscript call. Since ghostscript also allows '#' to be
used for the same purpose, se use it, for MSDOS batch file
compatibility.

When using system in perl, it returns the exit code multiplied by 256.
If a command returns 1, system("command") will return 256. Thus, to get
the real return value, we need to divide by 256.

However, we only need to check if the return value from the function or
call is not 0. So really the division by 256 is superfluous. Anything
different from system returning 0 (in which case the division will also
be 0) is an error.