Fix for wsplice to avoid warnings on some compilers.
Merge pull request #126 from ArmstrongJ/wsplice-fix

Fix for wsplice to avoid warnings on some compilers (MSVC for example)
correct build server to use new OWTOOLS environment variable
Generalize setvars script for OW compiler
Setup of OW compiler for build process is externalized.
Now it is user responsibility if select OW compiler for build process that setup selected OW compiler (OW version or 32/64-bit binaries) before configure/run build process
update build server after changes in setvars script
remove OW configuration, now it must be done before running build server if OW is used for building
remove OW configuration stuff from build server
Updated BUILD.md to reflect recent changes in setvars. Also added some comments about testing.
Add info about development testing command "builder buildtest"
Do small format changes.
minor change
use compiler defined NULL
add P1616NULL macro (16:16 NULL) for 32-bit DOS Extender
cleanup prototypes
use union for mixing input const char pointer and char pointer for allocated memory
don't use "global" as symbol name
don't use "member" or "public" as sysmbol names
don't use same symbol name for local and global sysmbols
replace "global" macro (used as decription) by UIAPI macro
add new prototypes for error buffer index
remove -Qtbb option and add -fast option for Intel compilers
optimize header file references in debugger project
optimize header file references in debugger project