cfunge 0.4.1

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0.4.1
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Major highlights:
 * cfunge can now track exact bounds for Funge Space (option at compile time).
 * Support for disabling some heavy parts of cfunge to reduce memory usage (see
   below for details).
Other important changes since last release:
 * For exact bounds: Implement sparse bounds minimising when difference is huge.
 * Reworked sysinfo code, now less overhead and more reused results (from time()
   and fungespace_get_bounds_rect()).
 * Bug fix: y pushed bounds wrong in certain cases.
 * Bug fix: Fixed OOM behaviour in cfunge on huge count for stack-stack begin.
 * DATE: Make sure constants are long double ones (L suffix). Do more of the
         conversion as integer math to reduce rounding errors. Make sure to
         always use int_least64_t internally for greatest precision. Add some
         missing function attributes.
 * TURT and FIXP: Use more exact value of pi than M_PI for long double
   calculations.
 * Added system for diagnostics output, collected in one place. This should make
   the error messages more uniform.
 * Added new command line switch (-E) to show non-fatal errors.
 * Added the command line switch (-v) to display build info and features in a
   compact format.
 * Reordered some code in file loading to make sure we don't push uninitialised
   size in i when trying to load an empty file.
 * Removed unused functions (cf_strndup() and cf_strnlen()).
 * Cleaned up includes (removing unused includes in header and source files).
 * Avoid malloc() calls in BASE. The max needed size is small and thus we can
   safely use a VLA.
 * Avoid some malloc() calls for fingerprint opcode stacks when they are empty.
   Now the actual stacks are not allocated until they are needed. Also "inline"
   the opcode stack metadata into the ip structs to reduce memory overhead.
 * Added the file doc/API_CHANGES documenting API changes. Please see that file
   for changes in the API.
 * Fixed build issue with IFFI.
 * Fixed handling of SSE intrinsics and inline asm for ICC in funge-space.c.
 * Build system:
   * Cleaned up warning flags in CMakeLists.txt.
   * Add options to disable some optional features even if needed dependencies
     found. Features that can be disabled are: clock_gettime(), ncurses,
     fingerprints using floating point, TURT.
   * Clean up CMakeLists.txt splitting some stuff out into separate files.