Compiler Option: -exx

Add error checking with KeyPgResumeResume support and array bounds/dimensions and 
null-pointer checking, plus stack overflow checking with gas64 backend

Syntax
	-exx

Description
	The -exx compiler option adds error checking with KeyPgResumeResume support, array 
	bounds and dimensions, and null-pointer checking (including the 
	procedure pointers), plus stack overflow checking with gas64 backend.

	Use of the -exx option automatically implies -e, -ex, -earray, 
	-earraydims, -elocation, and -enullptr, error checking and code 
	generation options.

Version
	* Before fbc 1.20.0, array dimensions were never checked.
	* Before fbc 1.10.0, stack overflow was never checked.

See also
	* KeyPgDdfberr__FB_ERR__
	* CompilerOpteCompiler Option: -e
	* CompilerOptearrayCompiler Option: -earray
	* CompilerOptearraydimsCompiler Option: -earraydims
	* CompilerOptelocationCompiler Option: -elocation
	* CompilerOptenullptrCompiler Option: -enullptr
	* CompilerOptexCompiler Option: -ex
	* ProPgErrorHandlingError Handling
	* CompilerCmdLineUsing the Command Line

