Removed the unreliable -include hack for e_config.h

e_config.h is now explicitly pulled in by all EEL core headers
instead, so dependencies are tracked properly. Couldn't get that
to work via CMake, and this is easier and more solid anyway, in
case someone needs to use some other build system.
Added missing exception XMODULELOAD used in builtin.eel
Added source info for EEL_VM_CHECKING code that deals with illegal values
HACK: generation of builtin.c from builtin.eel in cfg-all

Hacked generation of builtin.c  into cfg-all for now, so one
doesn't have to actually do it manually in the shell...
cfg-all now copies the tests scripts for eeltest.c

cfg-all now copies all the EEL test suite scripts into the build
directories, so eeltest[.exe] will work out of the box after
building.