Pike compiler mega patch. Added predef::CompilerEnvironment, which is a wrapper for struct compilation. Moved the definition of struct compilation to the new header file "pike_compiler.h". The compilation struct is now contained in the current context in the current_object during compilation. The global variable lex is no more, it has moved into the compilation struct. Added enter_compiler() and exit_compiler(). predef::compile() is now shorthand for predef::CompilerContext()->compile(). Rev: src/builtin_functions.c:1.652 Rev: src/compilation.h:1.35 Rev: src/docode.c:1.197 Rev: src/docode.h:1.20 Rev: src/dynamic_load.c:1.90 Rev: src/encode.c:1.263 Rev: src/language.yacc:1.411 Rev: src/las.c:1.406 Rev: src/lex.c:1.121 Rev: src/lex.h:1.36 Rev: src/lexer.h:1.66 Rev: src/module.c:1.52 Rev: src/object.c:1.284 Rev: src/operators.c:1.230 Rev: src/pike_compiler.h:1.1 Rev: src/pike_types.c:1.321 Rev: src/program.c:1.660 Rev: src/program.h:1.237