Aubit 4GL SVN-Code

- 4glc and fcompile can report which tokens the parser accepts at end of input
(A4GL_COMPLETE_FILE, see docs/completion_support.txt); fcompile spellings come from
complete_spell.h, generated from screen.lex by gen_complete_spell.sh.
- INCLINES (#line directives) never worked for programs without GLOBALS:
print_global_variable_init left suppress_lines raised. Also repeat the current #line
before continuation lines when merging the C file, so a multi-line declaration is not
attributed to later 4GL lines (debuggers put breakpoints in the prologue otherwise).
- LEX_NULL lextype (parse and check, write nothing) and A4GL_ERRFILE=- (errors to stdout):
docs/check_only_compile.txt.
- fglproto: terminate buffers, comma fix in the JS emitter.
- bin/fgllint is built by the default make in compilers/4glc.
- Move two prototypes into a4gl_incl_4gldef.h (generated code failed with implicit
declarations).